chore: regens API reference docs (#889)

diff --git a/docs/dyn/drive_v3.channels.html b/docs/dyn/drive_v3.channels.html
index af5542d..40aed86 100644
--- a/docs/dyn/drive_v3.channels.html
+++ b/docs/dyn/drive_v3.channels.html
@@ -75,20 +75,20 @@
 <h1><a href="drive_v3.html">Drive API</a> . <a href="drive_v3.channels.html">channels</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#stop">stop(body)</a></code></p>
+  <code><a href="#stop">stop(body=None)</a></code></p>
 <p class="firstline">Stop watching resources through this channel</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="stop">stop(body)</code>
+    <code class="details" id="stop">stop(body=None)</code>
   <pre>Stop watching resources through this channel
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # An notification channel used to watch for resource changes.
     "resourceUri": "A String", # A version-specific identifier for the watched resource.
-    "kind": "api#channel", # Identifies this as a notification channel used to watch for changes to a resource. Value: the fixed string "api#channel".
+    "kind": "api#channel", # Identifies this as a notification channel used to watch for changes to a resource, which is "api#channel".
     "resourceId": "A String", # An opaque ID that identifies the resource being watched on this channel. Stable across different API versions.
     "payload": True or False, # A Boolean value to indicate whether payload is wanted. Optional.
     "token": "A String", # An arbitrary string delivered to the target address with each notification delivered over this channel. Optional.