Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="dataflow_v1b3.html">Dataflow API</a> . <a href="dataflow_v1b3.projects.html">projects</a> . <a href="dataflow_v1b3.projects.locations.html">locations</a> . <a href="dataflow_v1b3.projects.locations.sql.html">sql</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#validate">validate(projectId, location, query=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Validates a GoogleSQL query for Cloud Dataflow syntax. Will always</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="validate">validate(projectId, location, query=None, x__xgafv=None)</code>
+  <pre>Validates a GoogleSQL query for Cloud Dataflow syntax. Will always
+confirm the given query parses correctly, and if able to look up
+schema information from DataCatalog, will validate that the query
+analyzes properly as well.
+
+Args:
+  projectId: string, Required. The ID of the Cloud Platform project that the job belongs to. (required)
+  location: string, The [regional endpoint]
+(https://cloud.google.com/dataflow/docs/concepts/regional-endpoints) to
+which to direct the request. (required)
+  query: string, The sql query to validate.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Response to the validation request.
+    "errorMessage": "A String", # Will be empty if validation succeeds.
+  }</pre>
+</div>
+
+</body></html>
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