Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/language_v1beta2.html b/docs/dyn/language_v1beta2.html
index 143df2f..65be2f3 100644
--- a/docs/dyn/language_v1beta2.html
+++ b/docs/dyn/language_v1beta2.html
@@ -72,7 +72,7 @@
 
 </style>
 
-<h1><a href="language_v1beta2.html">Google Cloud Natural Language API</a></h1>
+<h1><a href="language_v1beta2.html">Cloud Natural Language API</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
   <code><a href="language_v1beta2.documents.html">documents()</a></code>