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/spanner_v1.projects.instances.databases.html b/docs/dyn/spanner_v1.projects.instances.databases.html
index ee90725..026ee47 100644
--- a/docs/dyn/spanner_v1.projects.instances.databases.html
+++ b/docs/dyn/spanner_v1.projects.instances.databases.html
@@ -85,13 +85,13 @@
 <p class="firstline">Returns the sessions Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(parent=None, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a new Cloud Spanner database and starts to prepare it for serving.</p>
 <p class="toc_element">
   <code><a href="#dropDatabase">dropDatabase(database, x__xgafv=None)</a></code></p>
 <p class="firstline">Drops (aka deletes) a Cloud Spanner database.</p>
 <p class="toc_element">
-  <code><a href="#get">get(name=None, x__xgafv=None)</a></code></p>
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the state of a Cloud Spanner database.</p>
 <p class="toc_element">
   <code><a href="#getDdl">getDdl(database, x__xgafv=None)</a></code></p>
@@ -100,7 +100,7 @@
   <code><a href="#getIamPolicy">getIamPolicy(resource, body, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the access control policy for a database resource. Returns an empty</p>
 <p class="toc_element">
-  <code><a href="#list">list(parent=None, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
+  <code><a href="#list">list(parent, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Lists Cloud Spanner databases.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
@@ -116,7 +116,7 @@
 <p class="firstline">Updates the schema of a Cloud Spanner database by</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent=None, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body, x__xgafv=None)</code>
   <pre>Creates a new Cloud Spanner database and starts to prepare it for serving.
 The returned long-running operation will
 have a name of the format `<database_name>/operations/<operation_id>` and
@@ -269,7 +269,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="get">get(name=None, x__xgafv=None)</code>
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
   <pre>Gets the state of a Cloud Spanner database.
 
 Args:
@@ -543,7 +543,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(parent=None, pageSize=None, pageToken=None, x__xgafv=None)</code>
+    <code class="details" id="list">list(parent, pageSize=None, pageToken=None, x__xgafv=None)</code>
   <pre>Lists Cloud Spanner databases.
 
 Args: