Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="bigquerydatatransfer_v1.html">BigQuery Data Transfer API</a> . <a href="bigquerydatatransfer_v1.projects.html">projects</a> . <a href="bigquerydatatransfer_v1.projects.locations.html">locations</a> . <a href="bigquerydatatransfer_v1.projects.locations.transferConfigs.html">transferConfigs</a> . <a href="bigquerydatatransfer_v1.projects.locations.transferConfigs.runs.html">runs</a> . <a href="bigquerydatatransfer_v1.projects.locations.transferConfigs.runs.transferLogs.html">transferLogs</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(parent, pageToken=None, messageTypes=None, x__xgafv=None, pageSize=None)</a></code></p>
+<p class="firstline">Returns user facing log messages for the data transfer run.</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(parent, pageToken=None, messageTypes=None, x__xgafv=None, pageSize=None)</code>
+  <pre>Returns user facing log messages for the data transfer run.
+
+Args:
+  parent: string, Transfer run name in the form:
+`projects/{project_id}/transferConfigs/{config_Id}/runs/{run_id}`. (required)
+  pageToken: string, Pagination token, which can be used to request a specific page
+of `ListTransferLogsRequest` list results. For multiple-page
+results, `ListTransferLogsResponse` outputs
+a `next_page` token, which can be used as the
+`page_token` value to request the next page of list results.
+  messageTypes: string, Message types to return. If not populated - INFO, WARNING and ERROR
+messages are returned. (repeated)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, Page size. The default page size is the maximum value of 1000 results.
+
+Returns:
+  An object of the form:
+
+    { # The returned list transfer run messages.
+    "nextPageToken": "A String", # Output only. The next-pagination token. For multiple-page list results,
+        # this token can be used as the
+        # `GetTransferRunLogRequest.page_token`
+        # to request the next page of list results.
+    "transferMessages": [ # Output only. The stored pipeline transfer messages.
+      { # Represents a user facing message for a particular data transfer run.
+        "messageTime": "A String", # Time when message was logged.
+        "messageText": "A String", # Message text.
+        "severity": "A String", # Message severity.
+      },
+    ],
+  }</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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