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.operations.html">operations</a> . <a href="bigtableadmin_v2.operations.projects.html">projects</a> . <a href="bigtableadmin_v2.operations.projects.operations.html">operations</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(name, pageToken=None, x__xgafv=None, pageSize=None, filter=None)</a></code></p>
+<p class="firstline">Lists operations that match the specified filter in the request. If the</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>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="list">list(name, pageToken=None, x__xgafv=None, pageSize=None, filter=None)</code>
+  <pre>Lists operations that match the specified filter in the request. If the
+server doesn't support this method, it returns `UNIMPLEMENTED`.
+
+NOTE: the `name` binding allows API services to override the binding
+to use different resource name schemes, such as `users/*/operations`. To
+override the binding, API services can add a binding such as
+`"/v1/{name=users/*}/operations"` to their service configuration.
+For backwards compatibility, the default name includes the operations
+collection id, however overriding users must ensure the name binding
+is the parent resource, without the operations collection id.
+
+Args:
+  name: string, The name of the operation's parent resource. (required)
+  pageToken: string, The standard list page token.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, The standard list page size.
+  filter: string, The standard list filter.
+
+Returns:
+  An object of the form:
+
+    { # The response message for Operations.ListOperations.
+    "nextPageToken": "A String", # The standard List next-page token.
+    "operations": [ # A list of operations that matches the specified filter in the request.
+      { # 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>
+
+<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>
+
+</body></html>
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