chore: regens API reference docs (#889)

diff --git a/docs/dyn/appengine_v1beta.apps.services.html b/docs/dyn/appengine_v1beta.apps.services.html
index e47dee7..d7c4c51 100644
--- a/docs/dyn/appengine_v1beta.apps.services.html
+++ b/docs/dyn/appengine_v1beta.apps.services.html
@@ -92,7 +92,7 @@
   <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="#patch">patch(appsId, servicesId, body, migrateTraffic=None, updateMask=None, x__xgafv=None)</a></code></p>
+  <code><a href="#patch">patch(appsId, servicesId, body=None, migrateTraffic=None, updateMask=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates the configuration of the specified service.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -111,9 +111,6 @@
   An object of the form:
 
     { # This resource represents a long-running operation that is the result of a network API call.
-    "metadata": { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The Status type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by gRPC (https://github.com/grpc). Each Status message contains three pieces of data: error code, error message, and error details.You can find out more about this error model and how to work with it in the API Design Guide (https://cloud.google.com/apis/design/errors). # The error result of the operation in case of failure or cancellation.
       "message": "A String", # A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
       "code": 42, # The status code, which should be an enum value of google.rpc.Code.
@@ -128,6 +125,9 @@
       "a_key": "", # Properties of the object. Contains field @type with type URL.
     },
     "name": "A String", # The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the name should be a resource name ending with operations/{unique_id}.
+    "metadata": { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>
 
@@ -206,13 +206,13 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patch">patch(appsId, servicesId, body, migrateTraffic=None, updateMask=None, x__xgafv=None)</code>
+    <code class="details" id="patch">patch(appsId, servicesId, body=None, migrateTraffic=None, updateMask=None, x__xgafv=None)</code>
   <pre>Updates the configuration of the specified service.
 
 Args:
   appsId: string, Part of `name`. Name of the resource to update. Example: apps/myapp/services/default. (required)
   servicesId: string, Part of `name`. See documentation of `appsId`. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A Service resource is a logical component of an application that can share state and communicate in a secure fashion with other services. For example, an application that handles customer requests might include separate services to handle tasks such as backend data analysis or API requests from mobile devices. Each service has a collection of versions that define a specific set of code used to implement the functionality of that service.
@@ -237,9 +237,6 @@
   An object of the form:
 
     { # This resource represents a long-running operation that is the result of a network API call.
-    "metadata": { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The Status type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by gRPC (https://github.com/grpc). Each Status message contains three pieces of data: error code, error message, and error details.You can find out more about this error model and how to work with it in the API Design Guide (https://cloud.google.com/apis/design/errors). # The error result of the operation in case of failure or cancellation.
       "message": "A String", # A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
       "code": 42, # The status code, which should be an enum value of google.rpc.Code.
@@ -254,6 +251,9 @@
       "a_key": "", # Properties of the object. Contains field @type with type URL.
     },
     "name": "A String", # The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the name should be a resource name ending with operations/{unique_id}.
+    "metadata": { # Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>