Clean and regen docs (#401)

diff --git a/docs/dyn/iam_v1.roles.html b/docs/dyn/iam_v1.roles.html
index f2278e6..5ac5e6c 100644
--- a/docs/dyn/iam_v1.roles.html
+++ b/docs/dyn/iam_v1.roles.html
@@ -77,6 +77,9 @@
 <p class="toc_element">
   <code><a href="#queryGrantableRoles">queryGrantableRoles(body, x__xgafv=None)</a></code></p>
 <p class="firstline">Queries roles that can be granted on a particular resource.</p>
+<p class="toc_element">
+  <code><a href="#queryGrantableRoles_next">queryGrantableRoles_next(previous_request, previous_response)</a></code></p>
+<p class="firstline">Retrieves the next page of results.</p>
 <h3>Method Details</h3>
 <div class="method">
     <code class="details" id="queryGrantableRoles">queryGrantableRoles(body, x__xgafv=None)</code>
@@ -89,11 +92,14 @@
     The object takes the form of:
 
 { # The grantable role query request.
+    "pageToken": "A String", # Optional pagination token returned in an earlier
+        # QueryGrantableRolesResponse.
     "fullResourceName": "A String", # Required. The full resource name to query from the list of grantable roles.
         # 
         # The name follows the Google Cloud Platform resource format.
         # For example, a Cloud Platform project with id `my-project` will be named
         # `//cloudresourcemanager.googleapis.com/projects/my-project`.
+    "pageSize": 42, # Optional limit on the number of roles to include in the response.
   }
 
   x__xgafv: string, V1 error format.
@@ -105,9 +111,12 @@
   An object of the form:
 
     { # The grantable role query response.
+    "nextPageToken": "A String", # To retrieve the next page of results, set
+        # `QueryGrantableRolesRequest.page_token` to this value.
     "roles": [ # The list of matching roles.
       { # A role in the Identity and Access Management API.
-        "description": "A String", # Optional.  A human-readable description for the role.
+        "title": "A String", # Optional.  A human-readable title for the role.  Typically this
+            # is limited to 100 UTF-8 bytes.
         "name": "A String", # The name of the role.
             #
             # When Role is used in CreateRole, the role name must not be set.
@@ -115,11 +124,24 @@
             # When Role is used in output and other input such as UpdateRole, the role
             # name is the complete path, e.g., roles/logging.viewer for curated roles
             # and organizations/{ORGANIZATION_ID}/roles/logging.viewer for custom roles.
-        "title": "A String", # Optional.  A human-readable title for the role.  Typically this
-            # is limited to 100 UTF-8 bytes.
+        "description": "A String", # Optional.  A human-readable description for the role.
       },
     ],
   }</pre>
 </div>
 
+<div class="method">
+    <code class="details" id="queryGrantableRoles_next">queryGrantableRoles_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
 </body></html>
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