chore: regens API reference docs (#889)

diff --git a/docs/dyn/drive_v3.revisions.html b/docs/dyn/drive_v3.revisions.html
index c03d9a6..41e4dab 100644
--- a/docs/dyn/drive_v3.revisions.html
+++ b/docs/dyn/drive_v3.revisions.html
@@ -90,7 +90,7 @@
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#update">update(fileId, revisionId, body)</a></code></p>
+  <code><a href="#update">update(fileId, revisionId, body=None)</a></code></p>
 <p class="firstline">Updates a revision with patch semantics.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -217,13 +217,13 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(fileId, revisionId, body)</code>
+    <code class="details" id="update">update(fileId, revisionId, body=None)</code>
   <pre>Updates a revision with patch semantics.
 
 Args:
   fileId: string, The ID of the file. (required)
   revisionId: string, The ID of the revision. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The metadata for a revision to a file.