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/adexchangebuyer2_v2beta1.accounts.clients.users.html b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
index bc0ce40..b8a41dc 100644
--- a/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
+++ b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
@@ -75,20 +75,20 @@
 <h1><a href="adexchangebuyer2_v2beta1.html">Ad Exchange Buyer API II</a> . <a href="adexchangebuyer2_v2beta1.accounts.html">accounts</a> . <a href="adexchangebuyer2_v2beta1.accounts.clients.html">clients</a> . <a href="adexchangebuyer2_v2beta1.accounts.clients.users.html">users</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#get">get(accountId, clientAccountId=None, userId, x__xgafv=None)</a></code></p>
+  <code><a href="#get">get(accountId, clientAccountId, userId, x__xgafv=None)</a></code></p>
 <p class="firstline">Retrieves an existing client user.</p>
 <p class="toc_element">
-  <code><a href="#list">list(accountId=None, clientAccountId, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
+  <code><a href="#list">list(accountId, clientAccountId, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Lists all the known client users for a specified</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#update">update(accountId, clientAccountId=None, userId, body, x__xgafv=None)</a></code></p>
+  <code><a href="#update">update(accountId, clientAccountId, userId, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates an existing client user.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="get">get(accountId, clientAccountId=None, userId, x__xgafv=None)</code>
+    <code class="details" id="get">get(accountId, clientAccountId, userId, x__xgafv=None)</code>
   <pre>Retrieves an existing client user.
 
 Args:
@@ -130,7 +130,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(accountId=None, clientAccountId, pageSize=None, pageToken=None, x__xgafv=None)</code>
+    <code class="details" id="list">list(accountId, clientAccountId, pageSize=None, pageToken=None, x__xgafv=None)</code>
   <pre>Lists all the known client users for a specified
 sponsor buyer account ID.
 
@@ -208,7 +208,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(accountId, clientAccountId=None, userId, body, x__xgafv=None)</code>
+    <code class="details" id="update">update(accountId, clientAccountId, userId, body, x__xgafv=None)</code>
   <pre>Updates an existing client user.
 Only the user status can be changed on update.