chore: regens API reference docs (#889)

diff --git a/docs/dyn/classroom_v1.registrations.html b/docs/dyn/classroom_v1.registrations.html
index 0209be2..1495aaa 100644
--- a/docs/dyn/classroom_v1.registrations.html
+++ b/docs/dyn/classroom_v1.registrations.html
@@ -75,14 +75,14 @@
 <h1><a href="classroom_v1.html">Google Classroom API</a> . <a href="classroom_v1.registrations.html">registrations</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#create">create(body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a `Registration`, causing Classroom to start sending notifications</p>
 <p class="toc_element">
   <code><a href="#delete">delete(registrationId, x__xgafv=None)</a></code></p>
 <p class="firstline">Deletes a `Registration`, causing Classroom to stop sending notifications</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(body, x__xgafv=None)</code>
+    <code class="details" id="create">create(body=None, x__xgafv=None)</code>
   <pre>Creates a `Registration`, causing Classroom to start sending notifications
 from the provided `feed` to the destination provided in `cloudPubSubTopic`.
 
@@ -116,7 +116,7 @@
       not been granted permission to publish to it.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # An instruction to Classroom to send notifications from the `feed` to the