chore: regens API reference docs (#889)

diff --git a/docs/dyn/container_v1beta1.projects.zones.operations.html b/docs/dyn/container_v1beta1.projects.zones.operations.html
index d72f2ec..943b5af 100644
--- a/docs/dyn/container_v1beta1.projects.zones.operations.html
+++ b/docs/dyn/container_v1beta1.projects.zones.operations.html
@@ -75,7 +75,7 @@
 <h1><a href="container_v1beta1.html">Kubernetes Engine API</a> . <a href="container_v1beta1.projects.html">projects</a> . <a href="container_v1beta1.projects.zones.html">zones</a> . <a href="container_v1beta1.projects.zones.operations.html">operations</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#cancel">cancel(projectId, zone, operationId, body, x__xgafv=None)</a></code></p>
+  <code><a href="#cancel">cancel(projectId, zone, operationId, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Cancels the specified operation.</p>
 <p class="toc_element">
   <code><a href="#get">get(projectId, zone, operationId, name=None, x__xgafv=None)</a></code></p>
@@ -85,31 +85,33 @@
 <p class="firstline">Lists all operations in a project in the specified zone or all zones.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="cancel">cancel(projectId, zone, operationId, body, x__xgafv=None)</code>
+    <code class="details" id="cancel">cancel(projectId, zone, operationId, body=None, x__xgafv=None)</code>
   <pre>Cancels the specified operation.
 
 Args:
-  projectId: string, Deprecated. The Google Developers Console [project ID or project
+  projectId: string, Required. Deprecated. The Google Developers Console [project ID or project
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the name field. (required)
-  zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) in which the operation resides.
+  zone: string, Required. Deprecated. The name of the Google Compute Engine
+[zone](https://cloud.google.com/compute/docs/zones#available) in which the
+operation resides. This field has been deprecated and replaced by the name
+field. (required)
+  operationId: string, Required. Deprecated. The server-assigned `name` of the operation.
 This field has been deprecated and replaced by the name field. (required)
-  operationId: string, Deprecated. The server-assigned `name` of the operation.
-This field has been deprecated and replaced by the name field. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # CancelOperationRequest cancels a single operation.
-    "projectId": "A String", # Deprecated. The Google Developers Console [project ID or project
+    "projectId": "A String", # Required. Deprecated. The Google Developers Console [project ID or project
         # number](https://support.google.com/cloud/answer/6158840).
         # This field has been deprecated and replaced by the name field.
     "name": "A String", # The name (project, location, operation id) of the operation to cancel.
         # Specified in the format 'projects/*/locations/*/operations/*'.
-    "zone": "A String", # Deprecated. The name of the Google Compute Engine
-        # [zone](/compute/docs/zones#available) in which the operation resides.
-        # This field has been deprecated and replaced by the name field.
-    "operationId": "A String", # Deprecated. The server-assigned `name` of the operation.
+    "zone": "A String", # Required. Deprecated. The name of the Google Compute Engine
+        # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+        # operation resides. This field has been deprecated and replaced by the name
+        # field.
+    "operationId": "A String", # Required. Deprecated. The server-assigned `name` of the operation.
         # This field has been deprecated and replaced by the name field.
   }
 
@@ -138,14 +140,14 @@
   <pre>Gets the specified operation.
 
 Args:
-  projectId: string, Deprecated. The Google Developers Console [project ID or project
+  projectId: string, Required. Deprecated. The Google Developers Console [project ID or project
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the name field. (required)
-  zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) in which the cluster
-resides.
-This field has been deprecated and replaced by the name field. (required)
-  operationId: string, Deprecated. The server-assigned `name` of the operation.
+  zone: string, Required. Deprecated. The name of the Google Compute Engine
+[zone](https://cloud.google.com/compute/docs/zones#available) in which the
+cluster resides. This field has been deprecated and replaced by the name
+field. (required)
+  operationId: string, Required. Deprecated. The server-assigned `name` of the operation.
 This field has been deprecated and replaced by the name field. (required)
   name: string, The name (project, location, operation id) of the operation to get.
 Specified in the format 'projects/*/locations/*/operations/*'.
@@ -160,20 +162,13 @@
     { # This operation resource represents operations that may have happened or are
       # happening on the cluster. All fields are output only.
     "status": "A String", # The current status of the operation.
+    "statusMessage": "A String", # Output only. If an error has occurred, a textual description of the error.
     "endTime": "A String", # [Output only] The time the operation completed, in
         # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
     "name": "A String", # The server-assigned ID for the operation.
     "zone": "A String", # The name of the Google Compute Engine
-        # [zone](/compute/docs/zones#available) in which the operation
-        # is taking place.
-        # This field is deprecated, use location instead.
-    "location": "A String", # [Output only] The name of the Google Compute Engine
-        # [zone](/compute/docs/regions-zones/regions-zones#available) or
-        # [region](/compute/docs/regions-zones/regions-zones#available) in which
-        # the cluster resides.
-    "startTime": "A String", # [Output only] The time the operation started, in
-        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
-    "detail": "A String", # Detailed operation progress, if available.
+        # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+        # operation is taking place. This field is deprecated, use location instead.
     "clusterConditions": [ # Which conditions caused the current cluster state.
       { # StatusCondition describes why a cluster or a node pool has a certain status
           # (e.g., ERROR or DEGRADED).
@@ -181,9 +176,12 @@
         "code": "A String", # Machine-friendly representation of the condition
       },
     ],
-    "statusMessage": "A String", # If an error has occurred, a textual description of the error.
+    "startTime": "A String", # [Output only] The time the operation started, in
+        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+    "detail": "A String", # Detailed operation progress, if available.
+    "targetLink": "A String", # Server-defined URL for the target of the operation.
     "operationType": "A String", # The operation type.
-    "progress": { # Information about operation (or operation stage) progress. # [Output only] Progress information for an operation.
+    "progress": { # Information about operation (or operation stage) progress. # Output only. [Output only] Progress information for an operation.
       "status": "A String", # Status of an operation stage.
           # Unset for single-stage operations.
       "metrics": [ # Progress metric bundle, for example:
@@ -195,8 +193,7 @@
         { # Progress metric is (string, int|float|string) pair.
           "stringValue": "A String", # For metrics with custom values (ratios, visual progress, etc.).
           "intValue": "A String", # For metrics with integer value.
-          "name": "A String", # Metric name, required.
-              # e.g., "nodes total", "percent done"
+          "name": "A String", # Required. Metric name, e.g., "nodes total", "percent done".
           "doubleValue": 3.14, # For metrics with floating point value.
         },
       ],
@@ -214,7 +211,11 @@
       },
     ],
     "selfLink": "A String", # Server-defined URL for the resource.
-    "targetLink": "A String", # Server-defined URL for the target of the operation.
+    "location": "A String", # [Output only] The name of the Google Compute Engine
+        # [zone](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+        # or
+        # [region](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+        # in which the cluster resides.
   }</pre>
 </div>
 
@@ -223,12 +224,13 @@
   <pre>Lists all operations in a project in the specified zone or all zones.
 
 Args:
-  projectId: string, Deprecated. The Google Developers Console [project ID or project
+  projectId: string, Required. Deprecated. The Google Developers Console [project ID or project
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the parent field. (required)
-  zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) to return operations for, or `-` for
-all zones. This field has been deprecated and replaced by the parent field. (required)
+  zone: string, Required. Deprecated. The name of the Google Compute Engine
+[zone](https://cloud.google.com/compute/docs/zones#available) to return
+operations for, or `-` for all zones. This field has been deprecated and
+replaced by the parent field. (required)
   parent: string, The parent (project and location) where the operations will be listed.
 Specified in the format 'projects/*/locations/*'.
 Location "-" matches all zones and all regions.
@@ -245,20 +247,13 @@
       { # This operation resource represents operations that may have happened or are
           # happening on the cluster. All fields are output only.
         "status": "A String", # The current status of the operation.
+        "statusMessage": "A String", # Output only. If an error has occurred, a textual description of the error.
         "endTime": "A String", # [Output only] The time the operation completed, in
             # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
         "name": "A String", # The server-assigned ID for the operation.
         "zone": "A String", # The name of the Google Compute Engine
-            # [zone](/compute/docs/zones#available) in which the operation
-            # is taking place.
-            # This field is deprecated, use location instead.
-        "location": "A String", # [Output only] The name of the Google Compute Engine
-            # [zone](/compute/docs/regions-zones/regions-zones#available) or
-            # [region](/compute/docs/regions-zones/regions-zones#available) in which
-            # the cluster resides.
-        "startTime": "A String", # [Output only] The time the operation started, in
-            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
-        "detail": "A String", # Detailed operation progress, if available.
+            # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+            # operation is taking place. This field is deprecated, use location instead.
         "clusterConditions": [ # Which conditions caused the current cluster state.
           { # StatusCondition describes why a cluster or a node pool has a certain status
               # (e.g., ERROR or DEGRADED).
@@ -266,9 +261,12 @@
             "code": "A String", # Machine-friendly representation of the condition
           },
         ],
-        "statusMessage": "A String", # If an error has occurred, a textual description of the error.
+        "startTime": "A String", # [Output only] The time the operation started, in
+            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+        "detail": "A String", # Detailed operation progress, if available.
+        "targetLink": "A String", # Server-defined URL for the target of the operation.
         "operationType": "A String", # The operation type.
-        "progress": { # Information about operation (or operation stage) progress. # [Output only] Progress information for an operation.
+        "progress": { # Information about operation (or operation stage) progress. # Output only. [Output only] Progress information for an operation.
           "status": "A String", # Status of an operation stage.
               # Unset for single-stage operations.
           "metrics": [ # Progress metric bundle, for example:
@@ -280,8 +278,7 @@
             { # Progress metric is (string, int|float|string) pair.
               "stringValue": "A String", # For metrics with custom values (ratios, visual progress, etc.).
               "intValue": "A String", # For metrics with integer value.
-              "name": "A String", # Metric name, required.
-                  # e.g., "nodes total", "percent done"
+              "name": "A String", # Required. Metric name, e.g., "nodes total", "percent done".
               "doubleValue": 3.14, # For metrics with floating point value.
             },
           ],
@@ -299,7 +296,11 @@
           },
         ],
         "selfLink": "A String", # Server-defined URL for the resource.
-        "targetLink": "A String", # Server-defined URL for the target of the operation.
+        "location": "A String", # [Output only] The name of the Google Compute Engine
+            # [zone](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+            # or
+            # [region](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+            # in which the cluster resides.
       },
     ],
     "missingZones": [ # If any zones are listed here, the list of operations returned