chore: regens API reference docs (#889)

diff --git a/docs/dyn/youtubeAnalytics_v2.groupItems.html b/docs/dyn/youtubeAnalytics_v2.groupItems.html
index be4d886..5545f1f 100644
--- a/docs/dyn/youtubeAnalytics_v2.groupItems.html
+++ b/docs/dyn/youtubeAnalytics_v2.groupItems.html
@@ -78,7 +78,7 @@
   <code><a href="#delete">delete(onBehalfOfContentOwner=None, id=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Removes an item from a group.</p>
 <p class="toc_element">
-  <code><a href="#insert">insert(body, onBehalfOfContentOwner=None, x__xgafv=None)</a></code></p>
+  <code><a href="#insert">insert(body=None, onBehalfOfContentOwner=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a group item.</p>
 <p class="toc_element">
   <code><a href="#list">list(onBehalfOfContentOwner=None, groupId=None, x__xgafv=None)</a></code></p>
@@ -162,11 +162,11 @@
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(body, onBehalfOfContentOwner=None, x__xgafv=None)</code>
+    <code class="details" id="insert">insert(body=None, onBehalfOfContentOwner=None, x__xgafv=None)</code>
   <pre>Creates a group item.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A group item.
@@ -439,7 +439,6 @@
     ],
     "kind": "A String", # Identifies the API resource's type. The value will be
         # `youtube#groupItemListResponse`.
-    "etag": "A String", # The Etag of this resource.
     "errors": { # Request Error information. # Apiary error details
         #
         # The presence of an error field signals that the operation
@@ -487,6 +486,7 @@
         },
       ],
     },
+    "etag": "A String", # The Etag of this resource.
   }</pre>
 </div>