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.html b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.html
index 82b8290..0833852 100644
--- a/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.html
+++ b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.html
@@ -85,7 +85,7 @@
 <p class="firstline">Returns the users Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(accountId=None, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(accountId, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a new client buyer.</p>
 <p class="toc_element">
   <code><a href="#get">get(accountId, clientAccountId, x__xgafv=None)</a></code></p>
@@ -97,11 +97,11 @@
   <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=None, clientAccountId, body, x__xgafv=None)</a></code></p>
+  <code><a href="#update">update(accountId, clientAccountId, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates an existing client buyer.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(accountId=None, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(accountId, body, x__xgafv=None)</code>
   <pre>Creates a new client buyer.
 
 Args:
@@ -342,7 +342,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(accountId=None, clientAccountId, body, x__xgafv=None)</code>
+    <code class="details" id="update">update(accountId, clientAccountId, body, x__xgafv=None)</code>
   <pre>Updates an existing client buyer.
 
 Args: