Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+<html><body>
+<style>
+
+body, h1, h2, h3, div, span, p, pre, a {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-weight: inherit;
+  font-style: inherit;
+  font-size: 100%;
+  font-family: inherit;
+  vertical-align: baseline;
+}
+
+body {
+  font-size: 13px;
+  padding: 1em;
+}
+
+h1 {
+  font-size: 26px;
+  margin-bottom: 1em;
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+h2 {
+  font-size: 24px;
+  margin-bottom: 1em;
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+h3 {
+  font-size: 20px;
+  margin-bottom: 1em;
+  margin-top: 1em;
+}
+
+pre, code {
+  line-height: 1.5;
+  font-family: Monaco, 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Lucida Console', monospace;
+}
+
+pre {
+  margin-top: 0.5em;
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+
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+  font-family: Arial, sans serif;
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+h1, h2, h3 {
+  border-bottom: solid #CCC 1px;
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+.toc_element {
+  margin-top: 0.5em;
+}
+
+.firstline {
+  margin-left: 2 em;
+}
+
+.method  {
+  margin-top: 1em;
+  border: solid 1px #CCC;
+  padding: 1em;
+  background: #EEE;
+}
+
+.details {
+  font-weight: bold;
+  font-size: 14px;
+}
+
+</style>
+
+<h1><a href="firebasehosting_v1beta1.html">Firebase Hosting API</a> . <a href="firebasehosting_v1beta1.sites.html">sites</a> . <a href="firebasehosting_v1beta1.sites.versions.html">versions</a> . <a href="firebasehosting_v1beta1.sites.versions.files.html">files</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(parent, status=None, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
+<p class="firstline">Lists the remaining files to be uploaded for the specified version.</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(parent, status=None, pageToken=None, x__xgafv=None, pageSize=None)</code>
+  <pre>Lists the remaining files to be uploaded for the specified version.
+
+Args:
+  parent: string, Required. The parent to list files for, in the format:
+<code>sites/<var>site-name</var>/versions/<var>versionID</var></code> (required)
+  status: string, The type of files in the version that should be listed.
+  pageToken: string, The next_page_token from a previous request, if provided. This will be the
+encoded version of a firebase.hosting.proto.metadata.ListFilesPageToken.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, The page size to return. Defaults to 1000.
+
+Returns:
+  An object of the form:
+
+    {
+    "files": [ # The list path/hashes in the specified version.
+      { # A static content file that is part of a version.
+        "status": "A String", # Output only. The current status of a particular file in the specified
+            # version.
+            # <br>The value will be either `pending upload` or `uploaded`.
+        "path": "A String", # The URI at which the file's content should display.
+        "hash": "A String", # The SHA256 content hash of the file.
+      },
+    ],
+    "nextPageToken": "A String", # The pagination token, if more results exist.
+  }</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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