chore: regens API reference docs (#889)

diff --git a/docs/dyn/youtube_v3.channelSections.html b/docs/dyn/youtube_v3.channelSections.html
index 78d5ac5..8f79ff3 100644
--- a/docs/dyn/youtube_v3.channelSections.html
+++ b/docs/dyn/youtube_v3.channelSections.html
@@ -78,13 +78,13 @@
   <code><a href="#delete">delete(id, onBehalfOfContentOwner=None)</a></code></p>
 <p class="firstline">Deletes a channelSection.</p>
 <p class="toc_element">
-  <code><a href="#insert">insert(part, body, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</a></code></p>
+  <code><a href="#insert">insert(part, body=None, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</a></code></p>
 <p class="firstline">Adds a channelSection for the authenticated user's channel.</p>
 <p class="toc_element">
   <code><a href="#list">list(part, onBehalfOfContentOwner=None, hl=None, channelId=None, mine=None, id=None)</a></code></p>
 <p class="firstline">Returns channelSection resources that match the API request criteria.</p>
 <p class="toc_element">
-  <code><a href="#update">update(part, body, onBehalfOfContentOwner=None)</a></code></p>
+  <code><a href="#update">update(part, body=None, onBehalfOfContentOwner=None)</a></code></p>
 <p class="firstline">Update a channelSection.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -100,14 +100,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(part, body, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</code>
+    <code class="details" id="insert">insert(part, body=None, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</code>
   <pre>Adds a channelSection for the authenticated user's channel.
 
 Args:
   part: string, The part parameter serves two purposes in this operation. It identifies the properties that the write operation will set as well as the properties that the API response will include.
 
 The part names that you can include in the parameter value are snippet and contentDetails. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
@@ -275,14 +275,14 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(part, body, onBehalfOfContentOwner=None)</code>
+    <code class="details" id="update">update(part, body=None, onBehalfOfContentOwner=None)</code>
   <pre>Update a channelSection.
 
 Args:
   part: string, The part parameter serves two purposes in this operation. It identifies the properties that the write operation will set as well as the properties that the API response will include.
 
 The part names that you can include in the parameter value are snippet and contentDetails. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {