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/pubsub_v1.projects.snapshots.html b/docs/dyn/pubsub_v1.projects.snapshots.html
index 5a15e7f..96378be 100644
--- a/docs/dyn/pubsub_v1.projects.snapshots.html
+++ b/docs/dyn/pubsub_v1.projects.snapshots.html
@@ -75,17 +75,17 @@
 <h1><a href="pubsub_v1.html">Google Cloud Pub/Sub API</a> . <a href="pubsub_v1.projects.html">projects</a> . <a href="pubsub_v1.projects.snapshots.html">snapshots</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#getIamPolicy">getIamPolicy(resource=None, x__xgafv=None)</a></code></p>
+  <code><a href="#getIamPolicy">getIamPolicy(resource, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the access control policy for a resource.</p>
 <p class="toc_element">
-  <code><a href="#setIamPolicy">setIamPolicy(resource=None, body, x__xgafv=None)</a></code></p>
+  <code><a href="#setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Sets the access control policy on the specified resource. Replaces any</p>
 <p class="toc_element">
-  <code><a href="#testIamPermissions">testIamPermissions(resource=None, body, x__xgafv=None)</a></code></p>
+  <code><a href="#testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Returns permissions that a caller has on the specified resource.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="getIamPolicy">getIamPolicy(resource=None, x__xgafv=None)</code>
+    <code class="details" id="getIamPolicy">getIamPolicy(resource, x__xgafv=None)</code>
   <pre>Gets the access control policy for a resource.
 Returns an empty policy if the resource exists and does not have a policy
 set.
@@ -180,7 +180,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setIamPolicy">setIamPolicy(resource=None, body, x__xgafv=None)</code>
+    <code class="details" id="setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</code>
   <pre>Sets the access control policy on the specified resource. Replaces any
 existing policy.
 
@@ -359,7 +359,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="testIamPermissions">testIamPermissions(resource=None, body, x__xgafv=None)</code>
+    <code class="details" id="testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</code>
   <pre>Returns permissions that a caller has on the specified resource.
 If the resource does not exist, this will return an empty set of
 permissions, not a NOT_FOUND error.