Fix method doc signatures for multiline required parameters (#374)

* Fix method doc signatures for multiline required parameters.

Existing doc generator failed to recognize parameters as required when parameter descriptions
extended over more than one line. Besides presenting incorrect information, resulting
inconsistencies broke checks for automated sample generation.

* Regen docs
diff --git a/docs/dyn/youtube_v3.channelSections.html b/docs/dyn/youtube_v3.channelSections.html
index 6be2954..78d5ac5 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=None, body, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</a></code></p>
+  <code><a href="#insert">insert(part, body, 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=None, onBehalfOfContentOwner=None, hl=None, channelId=None, mine=None, id=None)</a></code></p>
+  <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=None, body, onBehalfOfContentOwner=None)</a></code></p>
+  <code><a href="#update">update(part, body, onBehalfOfContentOwner=None)</a></code></p>
 <p class="firstline">Update a channelSection.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -100,7 +100,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(part=None, body, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</code>
+    <code class="details" id="insert">insert(part, body, onBehalfOfContentOwner=None, onBehalfOfContentOwnerChannel=None)</code>
   <pre>Adds a channelSection for the authenticated user's channel.
 
 Args:
@@ -206,7 +206,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(part=None, onBehalfOfContentOwner=None, hl=None, channelId=None, mine=None, id=None)</code>
+    <code class="details" id="list">list(part, onBehalfOfContentOwner=None, hl=None, channelId=None, mine=None, id=None)</code>
   <pre>Returns channelSection resources that match the API request criteria.
 
 Args:
@@ -275,7 +275,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(part=None, body, onBehalfOfContentOwner=None)</code>
+    <code class="details" id="update">update(part, body, onBehalfOfContentOwner=None)</code>
   <pre>Update a channelSection.
 
 Args: