chore: regens API reference docs (#889)

diff --git a/docs/dyn/pubsub_v1beta1a.topics.html b/docs/dyn/pubsub_v1beta1a.topics.html
index b68e55f..8c8586b 100644
--- a/docs/dyn/pubsub_v1beta1a.topics.html
+++ b/docs/dyn/pubsub_v1beta1a.topics.html
@@ -75,7 +75,7 @@
 <h1><a href="pubsub_v1beta1a.html">Cloud Pub/Sub API</a> . <a href="pubsub_v1beta1a.topics.html">topics</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 the given topic with the given name.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(topic, x__xgafv=None)</a></code></p>
@@ -90,18 +90,18 @@
   <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="#publish">publish(body, x__xgafv=None)</a></code></p>
+  <code><a href="#publish">publish(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Adds a message to the topic.  Returns NOT_FOUND if the topic does not</p>
 <p class="toc_element">
-  <code><a href="#publishBatch">publishBatch(body, x__xgafv=None)</a></code></p>
+  <code><a href="#publishBatch">publishBatch(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Adds one or more messages to the topic. Returns NOT_FOUND if the topic does</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 the given topic with the given name.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A topic resource.
@@ -181,7 +181,7 @@
 
 Args:
   maxResults: integer, Maximum number of topics to return.
-  pageToken: string, The value obtained in the last <code>ListTopicsResponse</code>
+  pageToken: string, The value obtained in the last &lt;code&gt;ListTopicsResponse&lt;/code&gt;
 for continuation.
   query: string, A valid label query expression.
   x__xgafv: string, V1 error format.
@@ -194,7 +194,7 @@
 
     { # Response for the ListTopics method.
     "nextPageToken": "A String", # If not empty, indicates that there are more topics that match the request,
-        # and this value should be passed to the next <code>ListTopicsRequest</code>
+        # and this value should be passed to the next &lt;code&gt;ListTopicsRequest&lt;/code&gt;
         # to continue.
     "topic": [ # The resulting topics.
       { # A topic resource.
@@ -219,12 +219,12 @@
 </div>
 
 <div class="method">
-    <code class="details" id="publish">publish(body, x__xgafv=None)</code>
+    <code class="details" id="publish">publish(body=None, x__xgafv=None)</code>
   <pre>Adds a message to the topic.  Returns NOT_FOUND if the topic does not
 exist.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the Publish method.
@@ -291,12 +291,12 @@
 </div>
 
 <div class="method">
-    <code class="details" id="publishBatch">publishBatch(body, x__xgafv=None)</code>
+    <code class="details" id="publishBatch">publishBatch(body=None, x__xgafv=None)</code>
   <pre>Adds one or more messages to the topic. Returns NOT_FOUND if the topic does
 not exist.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Request for the PublishBatch method.