docs: update generated docs (#981)

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+
+<h1><a href="gmailpostmastertools_v1beta1.html">Gmail Postmaster Tools API</a> . <a href="gmailpostmastertools_v1beta1.domains.html">domains</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="gmailpostmastertools_v1beta1.domains.trafficStats.html">trafficStats()</a></code>
+</p>
+<p class="firstline">Returns the trafficStats Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Gets a specific domain registered by the client.</p>
+<p class="toc_element">
+  <code><a href="#list">list(pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Lists the domains that have been registered by the client. The order of</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>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Gets a specific domain registered by the client.
+Returns NOT_FOUND if the domain does not exist.
+
+Args:
+  name: string, The resource name of the domain. It should have the form
+`domains/{domain_name}`, where domain_name is the fully qualified
+domain name. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A registered domain resource in the Postmaster API.
+    &quot;permission&quot;: &quot;A String&quot;, # User’s permission for this domain. Assigned by the server.
+    &quot;name&quot;: &quot;A String&quot;, # The resource name of the Domain.
+        # Domain names have the form `domains/{domain_name}`, where domain_name
+        # is the fully qualified domain name (i.e.,  mymail.mydomain.com).
+    &quot;createTime&quot;: &quot;A String&quot;, # Timestamp when the user registered this domain. Assigned by
+        # the server.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(pageSize=None, pageToken=None, x__xgafv=None)</code>
+  <pre>Lists the domains that have been registered by the client. The order of
+domains in the response is unspecified and non-deterministic. Newly created
+domains will not necessarily be added to the end of this list.
+
+Args:
+  pageSize: integer, Requested page size. Server may return fewer domains than requested.
+If unspecified, server will pick an appropriate default.
+  pageToken: string, The next_page_token value returned from a previous List request, if any.
+This is the value of
+ListDomainsResponse.next_page_token
+returned from the previous call to `ListDomains` method.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Response message for ListDomains.
+    &quot;nextPageToken&quot;: &quot;A String&quot;, # Token to retrieve the next page of results, or empty if there are no
+        # more results in the list.
+    &quot;domains&quot;: [ # The list of domains.
+      { # A registered domain resource in the Postmaster API.
+        &quot;permission&quot;: &quot;A String&quot;, # User’s permission for this domain. Assigned by the server.
+        &quot;name&quot;: &quot;A String&quot;, # The resource name of the Domain.
+            # Domain names have the form `domains/{domain_name}`, where domain_name
+            # is the fully qualified domain name (i.e.,  mymail.mydomain.com).
+        &quot;createTime&quot;: &quot;A String&quot;, # Timestamp when the user registered this domain. Assigned by
+            # the server.
+      },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list_next">list_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 &#x27;execute()&#x27; 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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