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.activities.html b/docs/dyn/youtube_v3.activities.html
index 0ca403f..f489f71 100644
--- a/docs/dyn/youtube_v3.activities.html
+++ b/docs/dyn/youtube_v3.activities.html
@@ -78,7 +78,7 @@
   <code><a href="#insert">insert(part, body)</a></code></p>
 <p class="firstline">Posts a bulletin for a specific channel. (The user submitting the request must be authorized to act on the channel's behalf.)</p>
 <p class="toc_element">
-  <code><a href="#list">list(part=None, pageToken=None, publishedBefore=None, channelId=None, mine=None, maxResults=None, regionCode=None, home=None, publishedAfter=None)</a></code></p>
+  <code><a href="#list">list(part, pageToken=None, publishedBefore=None, channelId=None, mine=None, maxResults=None, regionCode=None, home=None, publishedAfter=None)</a></code></p>
 <p class="firstline">Returns a list of channel activity events that match the request criteria. For example, you can retrieve events associated with a particular channel, events associated with the user's subscriptions and Google+ friends, or the YouTube home page feed, which is customized for each user.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
@@ -397,7 +397,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(part=None, pageToken=None, publishedBefore=None, channelId=None, mine=None, maxResults=None, regionCode=None, home=None, publishedAfter=None)</code>
+    <code class="details" id="list">list(part, pageToken=None, publishedBefore=None, channelId=None, mine=None, maxResults=None, regionCode=None, home=None, publishedAfter=None)</code>
   <pre>Returns a list of channel activity events that match the request criteria. For example, you can retrieve events associated with a particular channel, events associated with the user's subscriptions and Google+ friends, or the YouTube home page feed, which is customized for each user.
 
 Args: