chore: regens API reference docs (#889)

diff --git a/docs/dyn/compute_alpha.targetVpnGateways.html b/docs/dyn/compute_alpha.targetVpnGateways.html
index 2e32eac..2c03a31 100644
--- a/docs/dyn/compute_alpha.targetVpnGateways.html
+++ b/docs/dyn/compute_alpha.targetVpnGateways.html
@@ -75,7 +75,7 @@
 <h1><a href="compute_alpha.html">Compute Engine API</a> . <a href="compute_alpha.targetVpnGateways.html">targetVpnGateways</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None, includeAllScopes=None)</a></code></p>
 <p class="firstline">Retrieves an aggregated list of target VPN gateways.</p>
 <p class="toc_element">
   <code><a href="#aggregatedList_next">aggregatedList_next(previous_request, previous_response)</a></code></p>
@@ -87,41 +87,43 @@
   <code><a href="#get">get(project, region, targetVpnGateway)</a></code></p>
 <p class="firstline">Returns the specified target VPN gateway. Gets a list of available target VPN gateways by making a list() request.</p>
 <p class="toc_element">
-  <code><a href="#insert">insert(project, region, body, requestId=None)</a></code></p>
+  <code><a href="#insert">insert(project, region, body=None, requestId=None)</a></code></p>
 <p class="firstline">Creates a target VPN gateway in the specified project and region using the data included in the request.</p>
 <p class="toc_element">
-  <code><a href="#list">list(project, region, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#list">list(project, region, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None)</a></code></p>
 <p class="firstline">Retrieves a list of target VPN gateways available to the specified project and region.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#setLabels">setLabels(project, region, resource, body, requestId=None)</a></code></p>
+  <code><a href="#setLabels">setLabels(project, region, resource, body=None, requestId=None)</a></code></p>
 <p class="firstline">Sets the labels on a TargetVpnGateway. To learn more about labels, read the Labeling Resources documentation.</p>
 <p class="toc_element">
-  <code><a href="#testIamPermissions">testIamPermissions(project, region, resource, body)</a></code></p>
+  <code><a href="#testIamPermissions">testIamPermissions(project, region, resource, body=None)</a></code></p>
 <p class="firstline">Returns permissions that a caller has on the specified resource.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="aggregatedList">aggregatedList(project, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None, includeAllScopes=None)</code>
   <pre>Retrieves an aggregated list of target VPN gateways.
 
 Args:
   project: string, Project ID for this request. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
+  includeAllScopes: boolean, Indicates whether every visible scope for each scope type (zone, region, global) should be included in the response. For new resource types added after this field, the flag has no effect as new resource types will always include every visible scope for each scope type in response. For resource types which predate this field, if this flag is omitted or false, only scopes of the scope types where the resource type is expected to be found will be included.
 
 Returns:
   An object of the form:
@@ -134,7 +136,7 @@
         "targetVpnGateways": [ # [Output Only] A list of target VPN gateways contained in this scope.
           { # Represents a Target VPN Gateway resource.
                 #
-                # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for beta.targetVpnGateways ==) (== resource_for v1.targetVpnGateways ==)
+                # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for {$api_version}.targetVpnGateways ==)
               "status": "A String", # [Output Only] The status of the VPN gateway, which can be one of the following: CREATING, READY, FAILED, or DELETING.
               "kind": "compute#targetVpnGateway", # [Output Only] Type of resource. Always compute#targetVpnGateway for target VPN gateways.
               "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
@@ -144,7 +146,7 @@
               "labelFingerprint": "A String", # A fingerprint for the labels being applied to this TargetVpnGateway, which is essentially a hash of the labels set used for optimistic locking. The fingerprint is initially generated by Compute Engine and changes after every request to modify or update labels. You must always provide an up-to-date fingerprint hash in order to update or change labels, otherwise the request will fail with error 412 conditionNotMet.
                   #
                   # To see the latest fingerprint, make a get() request to retrieve a TargetVpnGateway.
-              "labels": { # Labels to apply to this TargetVpnGateway resource. These can be later modified by the setLabels method. Each label key/value must comply with RFC1035. Label values may be empty.
+              "labels": { # Labels for this resource. These can only be added or modified by the setLabels method. Each label key/value pair must comply with RFC1035. Label values may be empty.
                 "a_key": "A String",
               },
               "forwardingRules": [ # [Output Only] A list of URLs to the ForwardingRule resources. ForwardingRules are created using compute.forwardingRules.insert and associated with a VPN gateway.
@@ -182,6 +184,9 @@
         },
       ],
     },
+    "unreachables": [ # [Output Only] Unreachable resources.
+      "A String",
+    ],
     "id": "A String", # [Output Only] Unique identifier for the resource; defined by the server.
     "selfLink": "A String", # [Output Only] Server-defined URL for this resource.
   }</pre>
@@ -220,26 +225,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -255,10 +264,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -289,7 +298,7 @@
 
     { # Represents a Target VPN Gateway resource.
         #
-        # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for beta.targetVpnGateways ==) (== resource_for v1.targetVpnGateways ==)
+        # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for {$api_version}.targetVpnGateways ==)
       "status": "A String", # [Output Only] The status of the VPN gateway, which can be one of the following: CREATING, READY, FAILED, or DELETING.
       "kind": "compute#targetVpnGateway", # [Output Only] Type of resource. Always compute#targetVpnGateway for target VPN gateways.
       "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
@@ -299,7 +308,7 @@
       "labelFingerprint": "A String", # A fingerprint for the labels being applied to this TargetVpnGateway, which is essentially a hash of the labels set used for optimistic locking. The fingerprint is initially generated by Compute Engine and changes after every request to modify or update labels. You must always provide an up-to-date fingerprint hash in order to update or change labels, otherwise the request will fail with error 412 conditionNotMet.
           #
           # To see the latest fingerprint, make a get() request to retrieve a TargetVpnGateway.
-      "labels": { # Labels to apply to this TargetVpnGateway resource. These can be later modified by the setLabels method. Each label key/value must comply with RFC1035. Label values may be empty.
+      "labels": { # Labels for this resource. These can only be added or modified by the setLabels method. Each label key/value pair must comply with RFC1035. Label values may be empty.
         "a_key": "A String",
       },
       "forwardingRules": [ # [Output Only] A list of URLs to the ForwardingRule resources. ForwardingRules are created using compute.forwardingRules.insert and associated with a VPN gateway.
@@ -315,18 +324,18 @@
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(project, region, body, requestId=None)</code>
+    <code class="details" id="insert">insert(project, region, body=None, requestId=None)</code>
   <pre>Creates a target VPN gateway in the specified project and region using the data included in the request.
 
 Args:
   project: string, Project ID for this request. (required)
   region: string, Name of the region for this request. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents a Target VPN Gateway resource.
       # 
-      # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for beta.targetVpnGateways ==) (== resource_for v1.targetVpnGateways ==)
+      # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for {$api_version}.targetVpnGateways ==)
     "status": "A String", # [Output Only] The status of the VPN gateway, which can be one of the following: CREATING, READY, FAILED, or DELETING.
     "kind": "compute#targetVpnGateway", # [Output Only] Type of resource. Always compute#targetVpnGateway for target VPN gateways.
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
@@ -336,7 +345,7 @@
     "labelFingerprint": "A String", # A fingerprint for the labels being applied to this TargetVpnGateway, which is essentially a hash of the labels set used for optimistic locking. The fingerprint is initially generated by Compute Engine and changes after every request to modify or update labels. You must always provide an up-to-date fingerprint hash in order to update or change labels, otherwise the request will fail with error 412 conditionNotMet.
         # 
         # To see the latest fingerprint, make a get() request to retrieve a TargetVpnGateway.
-    "labels": { # Labels to apply to this TargetVpnGateway resource. These can be later modified by the setLabels method. Each label key/value must comply with RFC1035. Label values may be empty.
+    "labels": { # Labels for this resource. These can only be added or modified by the setLabels method. Each label key/value pair must comply with RFC1035. Label values may be empty.
       "a_key": "A String",
     },
     "forwardingRules": [ # [Output Only] A list of URLs to the ForwardingRule resources. ForwardingRules are created using compute.forwardingRules.insert and associated with a VPN gateway.
@@ -361,26 +370,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -396,10 +409,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -417,7 +430,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(project, region, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="list">list(project, region, orderBy=None, maxResults=None, pageToken=None, returnPartialSuccess=None, filter=None)</code>
   <pre>Retrieves a list of target VPN gateways available to the specified project and region.
 
 Args:
@@ -425,18 +438,19 @@
   region: string, Name of the region for this request. (required)
   orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
 
-You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+You can also sort results in descending order based on the creation timestamp using `orderBy="creationTimestamp desc"`. This sorts results based on the `creationTimestamp` field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
 
-Currently, only sorting by name or creationTimestamp desc is supported.
-  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500, inclusive. (Default: 500)
-  pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
-  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either =, !=, >, or <.
+Currently, only sorting by `name` or `creationTimestamp desc` is supported.
+  maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than `maxResults`, Compute Engine returns a `nextPageToken` that can be used to get the next page of results in subsequent list requests. Acceptable values are `0` to `500`, inclusive. (Default: `500`)
+  pageToken: string, Specifies a page token to use. Set `pageToken` to the `nextPageToken` returned by a previous list request to get the next page of results.
+  returnPartialSuccess: boolean, Opt-in for partial success behavior which provides partial results in case of failure. The default value is false and the logic is the same as today.
+  filter: string, A filter expression that filters resources listed in the response. The expression must specify the field name, a comparison operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The comparison operator must be either `=`, `!=`, `&gt;`, or `&lt;`.
 
-For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance.
+For example, if you are filtering Compute Engine instances, you can exclude instances named `example-instance` by specifying `name != example-instance`.
 
-You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
+You can also filter nested fields. For example, you could specify `scheduling.automaticRestart = false` to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels.
 
-To filter on multiple expressions, provide each separate expression within parentheses. For example, (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake"). By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example, (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true).
+To filter on multiple expressions, provide each separate expression within parentheses. For example: ``` (scheduling.automaticRestart = true) (cpuPlatform = "Intel Skylake") ``` By default, each expression is an `AND` expression. However, you can include `AND` and `OR` expressions explicitly. For example: ``` (cpuPlatform = "Intel Skylake") OR (cpuPlatform = "Intel Broadwell") AND (scheduling.automaticRestart = true) ```
 
 Returns:
   An object of the form:
@@ -447,7 +461,7 @@
     "items": [ # A list of TargetVpnGateway resources.
       { # Represents a Target VPN Gateway resource.
             #
-            # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for beta.targetVpnGateways ==) (== resource_for v1.targetVpnGateways ==)
+            # The target VPN gateway resource represents a Classic Cloud VPN gateway. For more information, read the the Cloud VPN Overview. (== resource_for {$api_version}.targetVpnGateways ==)
           "status": "A String", # [Output Only] The status of the VPN gateway, which can be one of the following: CREATING, READY, FAILED, or DELETING.
           "kind": "compute#targetVpnGateway", # [Output Only] Type of resource. Always compute#targetVpnGateway for target VPN gateways.
           "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
@@ -457,7 +471,7 @@
           "labelFingerprint": "A String", # A fingerprint for the labels being applied to this TargetVpnGateway, which is essentially a hash of the labels set used for optimistic locking. The fingerprint is initially generated by Compute Engine and changes after every request to modify or update labels. You must always provide an up-to-date fingerprint hash in order to update or change labels, otherwise the request will fail with error 412 conditionNotMet.
               #
               # To see the latest fingerprint, make a get() request to retrieve a TargetVpnGateway.
-          "labels": { # Labels to apply to this TargetVpnGateway resource. These can be later modified by the setLabels method. Each label key/value must comply with RFC1035. Label values may be empty.
+          "labels": { # Labels for this resource. These can only be added or modified by the setLabels method. Each label key/value pair must comply with RFC1035. Label values may be empty.
             "a_key": "A String",
           },
           "forwardingRules": [ # [Output Only] A list of URLs to the ForwardingRule resources. ForwardingRules are created using compute.forwardingRules.insert and associated with a VPN gateway.
@@ -502,14 +516,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setLabels">setLabels(project, region, resource, body, requestId=None)</code>
+    <code class="details" id="setLabels">setLabels(project, region, resource, body=None, requestId=None)</code>
   <pre>Sets the labels on a TargetVpnGateway. To learn more about labels, read the Labeling Resources documentation.
 
 Args:
   project: string, Project ID for this request. (required)
   region: string, The region for this request. (required)
   resource: string, Name or id of the resource for this request. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -530,26 +544,30 @@
 
     { # Represents an Operation resource.
       #
+      # Google Compute Engine has three Operation resources:
+      #
+      # * [Global](/compute/docs/reference/rest/{$api_version}/globalOperations) * [Regional](/compute/docs/reference/rest/{$api_version}/regionOperations) * [Zonal](/compute/docs/reference/rest/{$api_version}/zoneOperations)
+      #
       # You can use an operation resource to manage asynchronous API requests. For more information, read Handling API responses.
       #
       # Operations can be global, regional or zonal.
-      # - For global operations, use the globalOperations resource.
-      # - For regional operations, use the regionOperations resource.
-      # - For zonal operations, use the zonalOperations resource.
+      # - For global operations, use the `globalOperations` resource.
+      # - For regional operations, use the `regionOperations` resource.
+      # - For zonal operations, use the `zonalOperations` resource.
       #
-      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for v1.globalOperations ==) (== resource_for beta.globalOperations ==) (== resource_for v1.regionOperations ==) (== resource_for beta.regionOperations ==) (== resource_for v1.zoneOperations ==) (== resource_for beta.zoneOperations ==)
+      # For more information, read  Global, Regional, and Zonal Resources. (== resource_for {$api_version}.globalOperations ==) (== resource_for {$api_version}.regionOperations ==) (== resource_for {$api_version}.zoneOperations ==)
     "targetId": "A String", # [Output Only] The unique target ID, which identifies a specific incarnation of the target resource.
     "clientOperationId": "A String", # [Output Only] The value of `requestId` if you provided it in the request. Not present otherwise.
     "creationTimestamp": "A String", # [Deprecated] This field is deprecated.
-    "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
+    "id": "A String", # [Output Only] The unique identifier for the operation. This identifier is defined by the server.
     "zone": "A String", # [Output Only] The URL of the zone where the operation resides. Only applicable when performing per-zone operations.
     "insertTime": "A String", # [Output Only] The time that this operation was requested. This value is in RFC3339 text format.
-    "operationType": "A String", # [Output Only] The type of operation, such as insert, update, or delete, and so on.
-    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.
+    "operationType": "A String", # [Output Only] The type of operation, such as `insert`, `update`, or `delete`, and so on.
+    "httpErrorMessage": "A String", # [Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as `NOT FOUND`.
     "progress": 42, # [Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.
-    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.
+    "httpErrorStatusCode": 42, # [Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a `404` means the resource was not found.
     "statusMessage": "A String", # [Output Only] An optional textual description of the current status of the operation.
-    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.
+    "status": "A String", # [Output Only] The status of the operation, which can be one of the following: `PENDING`, `RUNNING`, or `DONE`.
     "description": "A String", # [Output Only] A textual description of the operation, which is set when the operation is created.
     "warnings": [ # [Output Only] If warning messages are generated during processing of the operation, this field will be populated.
       {
@@ -565,10 +583,10 @@
       },
     ],
     "selfLinkWithId": "A String", # [Output Only] Server-defined URL for this resource with the resource id.
-    "user": "A String", # [Output Only] User who requested the operation, for example: user@example.com.
+    "user": "A String", # [Output Only] User who requested the operation, for example: `user@example.com`.
     "startTime": "A String", # [Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.
-    "kind": "compute#operation", # [Output Only] Type of the resource. Always compute#operation for Operation resources.
-    "name": "A String", # [Output Only] Name of the resource.
+    "kind": "compute#operation", # [Output Only] Type of the resource. Always `compute#operation` for Operation resources.
+    "name": "A String", # [Output Only] Name of the operation.
     "region": "A String", # [Output Only] The URL of the region where the operation resides. Only applicable when performing regional operations.
     "error": { # [Output Only] If errors are generated during processing of the operation, this field will be populated.
       "errors": [ # [Output Only] The array of errors encountered while processing this operation.
@@ -586,14 +604,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="testIamPermissions">testIamPermissions(project, region, resource, body)</code>
+    <code class="details" id="testIamPermissions">testIamPermissions(project, region, resource, body=None)</code>
   <pre>Returns permissions that a caller has on the specified resource.
 
 Args:
   project: string, Project ID for this request. (required)
   region: string, The name of the region for this request. (required)
   resource: string, Name or id of the resource for this request. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {