Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="bigtableadmin_v2.html">Cloud Bigtable Admin API</a> . <a href="bigtableadmin_v2.projects.html">projects</a> . <a href="bigtableadmin_v2.projects.instances.html">instances</a> . <a href="bigtableadmin_v2.projects.instances.appProfiles.html">appProfiles</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#create">create(parent, body, ignoreWarnings=None, appProfileId=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Creates an app profile within an instance.</p>
+<p class="toc_element">
+  <code><a href="#delete">delete(name, ignoreWarnings=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Deletes an app profile from an instance.</p>
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Gets information about an app profile.</p>
+<p class="toc_element">
+  <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
+<p class="firstline">Lists information about app profiles in an instance.</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="#patch">patch(name, body, ignoreWarnings=None, updateMask=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Updates an app profile within an instance.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="create">create(parent, body, ignoreWarnings=None, appProfileId=None, x__xgafv=None)</code>
+  <pre>Creates an app profile within an instance.
+
+Args:
+  parent: string, The unique name of the instance in which to create the new app profile.
+Values are of the form
+`projects/<project>/instances/<instance>`. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # A configuration object describing how Cloud Bigtable should treat traffic
+      # from a particular end user application.
+    "description": "A String", # Optional long form description of the use case for this AppProfile.
+    "etag": "A String", # Strongly validated etag for optimistic concurrency control. Preserve the
+        # value returned from `GetAppProfile` when calling `UpdateAppProfile` to
+        # fail the request if there has been a modification in the mean time. The
+        # `update_mask` of the request need not include `etag` for this protection
+        # to apply.
+        # See [Wikipedia](https://en.wikipedia.org/wiki/HTTP_ETag) and
+        # [RFC 7232](https://tools.ietf.org/html/rfc7232#section-2.3) for more
+        # details.
+    "singleClusterRouting": { # Unconditionally routes all read/write requests to a specific cluster. # Use a single-cluster routing policy.
+        # This option preserves read-your-writes consistency, but does not improve
+        # availability.
+      "clusterId": "A String", # The cluster to which read/write requests should be routed.
+      "allowTransactionalWrites": True or False, # Whether or not `CheckAndMutateRow` and `ReadModifyWriteRow` requests are
+          # allowed by this app profile. It is unsafe to send these requests to
+          # the same table/row/column in multiple clusters.
+    },
+    "name": "A String", # (`OutputOnly`)
+        # The unique name of the app profile. Values are of the form
+        # `projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`.
+    "multiClusterRoutingUseAny": { # Read/write requests may be routed to any cluster in the instance, and will # Use a multi-cluster routing policy that may pick any cluster.
+        # fail over to another cluster in the event of transient errors or delays.
+        # Choosing this option sacrifices read-your-writes consistency to improve
+        # availability.
+    },
+  }
+
+  ignoreWarnings: boolean, If true, ignore safety checks when creating the app profile.
+  appProfileId: string, The ID to be used when referring to the new app profile within its
+instance, e.g., just `myprofile` rather than
+`projects/myproject/instances/myinstance/appProfiles/myprofile`.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A configuration object describing how Cloud Bigtable should treat traffic
+        # from a particular end user application.
+      "description": "A String", # Optional long form description of the use case for this AppProfile.
+      "etag": "A String", # Strongly validated etag for optimistic concurrency control. Preserve the
+          # value returned from `GetAppProfile` when calling `UpdateAppProfile` to
+          # fail the request if there has been a modification in the mean time. The
+          # `update_mask` of the request need not include `etag` for this protection
+          # to apply.
+          # See [Wikipedia](https://en.wikipedia.org/wiki/HTTP_ETag) and
+          # [RFC 7232](https://tools.ietf.org/html/rfc7232#section-2.3) for more
+          # details.
+      "singleClusterRouting": { # Unconditionally routes all read/write requests to a specific cluster. # Use a single-cluster routing policy.
+          # This option preserves read-your-writes consistency, but does not improve
+          # availability.
+        "clusterId": "A String", # The cluster to which read/write requests should be routed.
+        "allowTransactionalWrites": True or False, # Whether or not `CheckAndMutateRow` and `ReadModifyWriteRow` requests are
+            # allowed by this app profile. It is unsafe to send these requests to
+            # the same table/row/column in multiple clusters.
+      },
+      "name": "A String", # (`OutputOnly`)
+          # The unique name of the app profile. Values are of the form
+          # `projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`.
+      "multiClusterRoutingUseAny": { # Read/write requests may be routed to any cluster in the instance, and will # Use a multi-cluster routing policy that may pick any cluster.
+          # fail over to another cluster in the event of transient errors or delays.
+          # Choosing this option sacrifices read-your-writes consistency to improve
+          # availability.
+      },
+    }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="delete">delete(name, ignoreWarnings=None, x__xgafv=None)</code>
+  <pre>Deletes an app profile from an instance.
+
+Args:
+  name: string, The unique name of the app profile to be deleted. Values are of the form
+`projects/<project>/instances/<instance>/appProfiles/<app_profile>`. (required)
+  ignoreWarnings: boolean, If true, ignore safety checks when deleting the app profile.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A generic empty message that you can re-use to avoid defining duplicated
+      # empty messages in your APIs. A typical example is to use it as the request
+      # or the response type of an API method. For instance:
+      #
+      #     service Foo {
+      #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+      #     }
+      #
+      # The JSON representation for `Empty` is empty JSON object `{}`.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Gets information about an app profile.
+
+Args:
+  name: string, The unique name of the requested app profile. Values are of the form
+`projects/<project>/instances/<instance>/appProfiles/<app_profile>`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A configuration object describing how Cloud Bigtable should treat traffic
+        # from a particular end user application.
+      "description": "A String", # Optional long form description of the use case for this AppProfile.
+      "etag": "A String", # Strongly validated etag for optimistic concurrency control. Preserve the
+          # value returned from `GetAppProfile` when calling `UpdateAppProfile` to
+          # fail the request if there has been a modification in the mean time. The
+          # `update_mask` of the request need not include `etag` for this protection
+          # to apply.
+          # See [Wikipedia](https://en.wikipedia.org/wiki/HTTP_ETag) and
+          # [RFC 7232](https://tools.ietf.org/html/rfc7232#section-2.3) for more
+          # details.
+      "singleClusterRouting": { # Unconditionally routes all read/write requests to a specific cluster. # Use a single-cluster routing policy.
+          # This option preserves read-your-writes consistency, but does not improve
+          # availability.
+        "clusterId": "A String", # The cluster to which read/write requests should be routed.
+        "allowTransactionalWrites": True or False, # Whether or not `CheckAndMutateRow` and `ReadModifyWriteRow` requests are
+            # allowed by this app profile. It is unsafe to send these requests to
+            # the same table/row/column in multiple clusters.
+      },
+      "name": "A String", # (`OutputOnly`)
+          # The unique name of the app profile. Values are of the form
+          # `projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`.
+      "multiClusterRoutingUseAny": { # Read/write requests may be routed to any cluster in the instance, and will # Use a multi-cluster routing policy that may pick any cluster.
+          # fail over to another cluster in the event of transient errors or delays.
+          # Choosing this option sacrifices read-your-writes consistency to improve
+          # availability.
+      },
+    }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</code>
+  <pre>Lists information about app profiles in an instance.
+
+Args:
+  parent: string, The unique name of the instance for which a list of app profiles is
+requested. Values are of the form
+`projects/<project>/instances/<instance>`.
+Use `<instance> = '-'` to list AppProfiles for all Instances in a project,
+e.g., `projects/myproject/instances/-`. (required)
+  pageToken: string, The value of `next_page_token` returned by a previous call.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, Maximum number of results per page.
+CURRENTLY UNIMPLEMENTED AND IGNORED.
+
+Returns:
+  An object of the form:
+
+    { # Response message for BigtableInstanceAdmin.ListAppProfiles.
+    "nextPageToken": "A String", # Set if not all app profiles could be returned in a single response.
+        # Pass this value to `page_token` in another request to get the next
+        # page of results.
+    "failedLocations": [ # Locations from which AppProfile information could not be retrieved,
+        # due to an outage or some other transient condition.
+        # AppProfiles from these locations may be missing from `app_profiles`.
+        # Values are of the form `projects/<project>/locations/<zone_id>`
+      "A String",
+    ],
+    "appProfiles": [ # The list of requested app profiles.
+      { # A configuration object describing how Cloud Bigtable should treat traffic
+            # from a particular end user application.
+          "description": "A String", # Optional long form description of the use case for this AppProfile.
+          "etag": "A String", # Strongly validated etag for optimistic concurrency control. Preserve the
+              # value returned from `GetAppProfile` when calling `UpdateAppProfile` to
+              # fail the request if there has been a modification in the mean time. The
+              # `update_mask` of the request need not include `etag` for this protection
+              # to apply.
+              # See [Wikipedia](https://en.wikipedia.org/wiki/HTTP_ETag) and
+              # [RFC 7232](https://tools.ietf.org/html/rfc7232#section-2.3) for more
+              # details.
+          "singleClusterRouting": { # Unconditionally routes all read/write requests to a specific cluster. # Use a single-cluster routing policy.
+              # This option preserves read-your-writes consistency, but does not improve
+              # availability.
+            "clusterId": "A String", # The cluster to which read/write requests should be routed.
+            "allowTransactionalWrites": True or False, # Whether or not `CheckAndMutateRow` and `ReadModifyWriteRow` requests are
+                # allowed by this app profile. It is unsafe to send these requests to
+                # the same table/row/column in multiple clusters.
+          },
+          "name": "A String", # (`OutputOnly`)
+              # The unique name of the app profile. Values are of the form
+              # `projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`.
+          "multiClusterRoutingUseAny": { # Read/write requests may be routed to any cluster in the instance, and will # Use a multi-cluster routing policy that may pick any cluster.
+              # fail over to another cluster in the event of transient errors or delays.
+              # Choosing this option sacrifices read-your-writes consistency to improve
+              # availability.
+          },
+        },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list_next">list_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
+<div class="method">
+    <code class="details" id="patch">patch(name, body, ignoreWarnings=None, updateMask=None, x__xgafv=None)</code>
+  <pre>Updates an app profile within an instance.
+
+Args:
+  name: string, (`OutputOnly`)
+The unique name of the app profile. Values are of the form
+`projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`. (required)
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # A configuration object describing how Cloud Bigtable should treat traffic
+      # from a particular end user application.
+    "description": "A String", # Optional long form description of the use case for this AppProfile.
+    "etag": "A String", # Strongly validated etag for optimistic concurrency control. Preserve the
+        # value returned from `GetAppProfile` when calling `UpdateAppProfile` to
+        # fail the request if there has been a modification in the mean time. The
+        # `update_mask` of the request need not include `etag` for this protection
+        # to apply.
+        # See [Wikipedia](https://en.wikipedia.org/wiki/HTTP_ETag) and
+        # [RFC 7232](https://tools.ietf.org/html/rfc7232#section-2.3) for more
+        # details.
+    "singleClusterRouting": { # Unconditionally routes all read/write requests to a specific cluster. # Use a single-cluster routing policy.
+        # This option preserves read-your-writes consistency, but does not improve
+        # availability.
+      "clusterId": "A String", # The cluster to which read/write requests should be routed.
+      "allowTransactionalWrites": True or False, # Whether or not `CheckAndMutateRow` and `ReadModifyWriteRow` requests are
+          # allowed by this app profile. It is unsafe to send these requests to
+          # the same table/row/column in multiple clusters.
+    },
+    "name": "A String", # (`OutputOnly`)
+        # The unique name of the app profile. Values are of the form
+        # `projects/<project>/instances/<instance>/appProfiles/_a-zA-Z0-9*`.
+    "multiClusterRoutingUseAny": { # Read/write requests may be routed to any cluster in the instance, and will # Use a multi-cluster routing policy that may pick any cluster.
+        # fail over to another cluster in the event of transient errors or delays.
+        # Choosing this option sacrifices read-your-writes consistency to improve
+        # availability.
+    },
+  }
+
+  ignoreWarnings: boolean, If true, ignore safety checks when updating the app profile.
+  updateMask: string, The subset of app profile fields which should be replaced.
+If unset, all fields will be replaced.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  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 # The error result of the operation in case of failure or cancellation.
+        # different programming environments, including REST APIs and RPC APIs. It is
+        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        #
+        # - Simple to use and understand for most users
+        # - Flexible enough to meet unexpected needs
+        #
+        # # Overview
+        #
+        # The `Status` message contains three pieces of data: error code, error
+        # message, and error details. The error code should be an enum value of
+        # google.rpc.Code, but it may accept additional error codes if needed.  The
+        # error message should be a developer-facing English message that helps
+        # developers *understand* and *resolve* the error. If a localized user-facing
+        # error message is needed, put the localized message in the error details or
+        # localize it in the client. The optional error details may contain arbitrary
+        # information about the error. There is a predefined set of error detail types
+        # in the package `google.rpc` that can be used for common error conditions.
+        #
+        # # Language mapping
+        #
+        # The `Status` message is the logical representation of the error model, but it
+        # is not necessarily the actual wire format. When the `Status` message is
+        # exposed in different client libraries and different wire protocols, it can be
+        # mapped differently. For example, it will likely be mapped to some exceptions
+        # in Java, but more likely mapped to some error codes in C.
+        #
+        # # Other uses
+        #
+        # The error model and the `Status` message can be used in a variety of
+        # environments, either with or without APIs, to provide a
+        # consistent developer experience across different environments.
+        #
+        # Example uses of this error model include:
+        #
+        # - Partial errors. If a service needs to return partial errors to the client,
+        #     it may embed the `Status` in the normal response to indicate the partial
+        #     errors.
+        #
+        # - Workflow errors. A typical workflow has multiple steps. Each step may
+        #     have a `Status` message for error reporting.
+        #
+        # - Batch operations. If a client uses batch request and batch response, the
+        #     `Status` message should be used directly inside batch response, one for
+        #     each error sub-response.
+        #
+        # - Asynchronous operations. If an API call embeds asynchronous operation
+        #     results in its response, the status of those operations should be
+        #     represented directly using the `Status` message.
+        #
+        # - Logging. If some API errors are stored in logs, the message `Status` could
+        #     be used directly after any stripping needed for security/privacy reasons.
+      "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.
+      "details": [ # A list of messages that carry the error details.  There is a common set of
+          # message types for APIs to use.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    },
+    "done": True or False, # If the value is `false`, it means the operation is still in progress.
+        # If `true`, the operation is completed, and either `error` or `response` is
+        # available.
+    "response": { # The normal response of the operation in case of success.  If the original
+        # method returns no data on success, such as `Delete`, the response is
+        # `google.protobuf.Empty`.  If the original method is standard
+        # `Get`/`Create`/`Update`, the response should be the resource.  For other
+        # methods, the response should have the type `XxxResponse`, where `Xxx`
+        # is the original method name.  For example, if the original method name
+        # is `TakeSnapshot()`, the inferred response type is
+        # `TakeSnapshotResponse`.
+      "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 have the format of `operations/some/unique/name`.
+  }</pre>
+</div>
+
+</body></html>
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