Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="run_v1alpha1.html">Cloud Run API</a> . <a href="run_v1alpha1.namespaces.html">namespaces</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.authorizeddomains.html">authorizeddomains()</a></code>
+</p>
+<p class="firstline">Returns the authorizeddomains Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.configurations.html">configurations()</a></code>
+</p>
+<p class="firstline">Returns the configurations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.domainmappings.html">domainmappings()</a></code>
+</p>
+<p class="firstline">Returns the domainmappings Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.eventtypes.html">eventtypes()</a></code>
+</p>
+<p class="firstline">Returns the eventtypes Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.revisions.html">revisions()</a></code>
+</p>
+<p class="firstline">Returns the revisions Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.routes.html">routes()</a></code>
+</p>
+<p class="firstline">Returns the routes Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.services.html">services()</a></code>
+</p>
+<p class="firstline">Returns the services Resource.</p>
+
+<p class="toc_element">
+  <code><a href="run_v1alpha1.namespaces.triggers.html">triggers()</a></code>
+</p>
+<p class="firstline">Returns the triggers Resource.</p>
+
+</body></html>
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