Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="container_v1beta1.html">Kubernetes Engine API</a> . <a href="container_v1beta1.projects.html">projects</a> . <a href="container_v1beta1.projects.zones.html">zones</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="container_v1beta1.projects.zones.clusters.html">clusters()</a></code>
+</p>
+<p class="firstline">Returns the clusters Resource.</p>
+
+<p class="toc_element">
+  <code><a href="container_v1beta1.projects.zones.operations.html">operations()</a></code>
+</p>
+<p class="firstline">Returns the operations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#getServerconfig">getServerconfig(projectId, zone, name=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns configuration info about the Google Kubernetes Engine service.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="getServerconfig">getServerconfig(projectId, zone, name=None, x__xgafv=None)</code>
+  <pre>Returns configuration info about the Google Kubernetes Engine service.
+
+Args:
+  projectId: string, Deprecated. The Google Developers Console [project ID or project
+number](https://support.google.com/cloud/answer/6158840).
+This field has been deprecated and replaced by the name field. (required)
+  zone: string, Deprecated. The name of the Google Compute Engine
+[zone](/compute/docs/zones#available) to return operations for.
+This field has been deprecated and replaced by the name field. (required)
+  name: string, The name (project and location) of the server config to get,
+specified in the format 'projects/*/locations/*'.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Kubernetes Engine service configuration.
+    "defaultClusterVersion": "A String", # Version of Kubernetes the service deploys by default.
+    "validNodeVersions": [ # List of valid node upgrade target versions.
+      "A String",
+    ],
+    "validImageTypes": [ # List of valid image types.
+      "A String",
+    ],
+    "validMasterVersions": [ # List of valid master versions.
+      "A String",
+    ],
+    "defaultImageType": "A String", # Default image type.
+  }</pre>
+</div>
+
+</body></html>
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