chore: regens API reference docs (#889)

diff --git a/docs/epy/googleapiclient.http.MediaIoBaseDownload-class.html b/docs/epy/googleapiclient.http.MediaIoBaseDownload-class.html
index 5c18583..d778930 100644
--- a/docs/epy/googleapiclient.http.MediaIoBaseDownload-class.html
+++ b/docs/epy/googleapiclient.http.MediaIoBaseDownload-class.html
@@ -58,13 +58,7 @@
 <!-- ==================== CLASS DESCRIPTION ==================== -->
 <h1 class="epydoc">Class MediaIoBaseDownload</h1><p class="nomargin-top"><span class="codelink"><a href="googleapiclient.http-pysrc.html#MediaIoBaseDownload">source&nbsp;code</a></span></p>
 <center>
-<center>  <map id="uml_class_diagram_for_googleap_32" name="uml_class_diagram_for_googleap_32">
-<area shape="rect" id="node1_2" href="googleapiclient.http.MediaIoBaseDownload-class.html#__init__" title="Constructor." alt="" coords="17,38,396,58"/>
-<area shape="rect" id="node1_3" href="googleapiclient.http.MediaIoBaseDownload-class.html#next_chunk" title="Get the next chunk of the download." alt="" coords="17,58,396,78"/>
-<area shape="rect" id="node1" href="googleapiclient.http.MediaIoBaseDownload-class.html" title="&quot;Download media resources." alt="" coords="5,5,408,84"/>
-</map>
-  <img src="uml_class_diagram_for_googleap_32.gif" alt='' usemap="#uml_class_diagram_for_googleap_32" ismap="ismap" class="graph-without-title" />
-</center>
+
 </center>
 <hr />
 <pre class="literalblock">
@@ -276,7 +270,7 @@
 
 Raises:
   googleapiclient.errors.HttpError if the response was not a 2xx.
-  httplib2.HttpLib2Error if a transport error has occured.
+  httplib2.HttpLib2Error if a transport error has occurred.
 
 </pre>
   <dl class="fields">
@@ -314,7 +308,7 @@
 <table border="0" cellpadding="0" cellspacing="0" width="100%%">
   <tr>
     <td align="left" class="footer">
-    Generated by Epydoc 3.0.1 on Fri Jun 14 15:57:28 2019
+    Generated by Epydoc 3.0.1 on Thu Apr 30 17:06:05 2020
     </td>
     <td align="right" class="footer">
       <a target="mainFrame" href="http://epydoc.sourceforge.net"