Regenerate docs. (#696)

diff --git a/docs/epy/toc.html b/docs/epy/toc.html
index 019e619..ac8c6d6 100644
--- a/docs/epy/toc.html
+++ b/docs/epy/toc.html
@@ -19,6 +19,9 @@
      onclick="setFrame('toc-googleapiclient-module.html','googleapiclient-module.html');"     >googleapiclient</a><br />  <div class="private">
     <a target="moduleFrame" href="toc-googleapiclient._auth-module.html"
      onclick="setFrame('toc-googleapiclient._auth-module.html','googleapiclient._auth-module.html');"     >googleapiclient._auth</a><br />  </div>
+  <div class="private">
+    <a target="moduleFrame" href="toc-googleapiclient._helpers-module.html"
+     onclick="setFrame('toc-googleapiclient._helpers-module.html','googleapiclient._helpers-module.html');"     >googleapiclient._helpers</a><br />  </div>
     <a target="moduleFrame" href="toc-googleapiclient.channel-module.html"
      onclick="setFrame('toc-googleapiclient.channel-module.html','googleapiclient.channel-module.html');"     >googleapiclient.channel</a><br />    <a target="moduleFrame" href="toc-googleapiclient.discovery-module.html"
      onclick="setFrame('toc-googleapiclient.discovery-module.html','googleapiclient.discovery-module.html');"     >googleapiclient.discovery</a><br />    <a target="moduleFrame" href="toc-googleapiclient.discovery_cache-module.html"