Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="cloudbilling_v1.html">Cloud Billing API</a> . <a href="cloudbilling_v1.services.html">services</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="cloudbilling_v1.services.skus.html">skus()</a></code>
+</p>
+<p class="firstline">Returns the skus Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#list">list(pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Lists all public cloud services.</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(pageSize=None, pageToken=None, x__xgafv=None)</code>
+  <pre>Lists all public cloud services.
+
+Args:
+  pageSize: integer, Requested page size. Defaults to 5000.
+  pageToken: string, A token identifying a page of results to return. This should be a
+`next_page_token` value returned from a previous `ListServices`
+call. If unspecified, the first page of results is returned.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Response message for `ListServices`.
+    "services": [ # A list of services.
+      { # Encapsulates a single service in Google Cloud Platform.
+        "displayName": "A String", # A human readable display name for this service.
+        "serviceId": "A String", # The identifier for the service.
+            # Example: "DA34-426B-A397"
+        "businessEntityName": "A String", # The business under which the service is offered.
+            # Ex. "businessEntities/GCP", "businessEntities/Maps"
+        "name": "A String", # The resource name for the service.
+            # Example: "services/DA34-426B-A397"
+      },
+    ],
+    "nextPageToken": "A String", # A token to retrieve the next page of results. To retrieve the next page,
+        # call `ListServices` again with the `page_token` field set to this
+        # value. This field is empty if there are no more results to retrieve.
+  }</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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