docs: docs update (#911)

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Fixes #<issue_number_goes_here> 🦕
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+<h1><a href="firebase_v1beta1.html">Firebase Management API</a> . <a href="firebase_v1beta1.projects.html">projects</a> . <a href="firebase_v1beta1.projects.availableLocations.html">availableLocations</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(parent, pageToken=None, pageSize=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns a list of valid Google Cloud Platform (GCP) resource locations for</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="list">list(parent, pageToken=None, pageSize=None, x__xgafv=None)</code>
+  <pre>Returns a list of valid Google Cloud Platform (GCP) resource locations for
+the specified Project (including a FirebaseProject).
+&lt;br&gt;
+&lt;br&gt;One of these locations can be selected as the Project&#x27;s [_default_ GCP
+resource location](https://firebase.google.com/docs/projects/locations),
+which is the geographical location where project resources, such as Cloud
+Firestore, will be provisioned by default. However, if the default GCP
+resource location has already been set for the Project, then this setting
+cannot be changed.
+&lt;br&gt;
+&lt;br&gt;This call checks for any possible
+[location
+restrictions](https://cloud.google.com/resource-manager/docs/organization-policy/defining-locations)
+for the specified Project and, thus, might return a subset of all possible
+GCP resource locations. To list all GCP resource locations (regardless of
+any restrictions), call the endpoint without specifying a `projectId` (that
+is, `/v1beta1/{parent=projects/-}/listAvailableLocations`).
+&lt;br&gt;
+&lt;br&gt;To call `ListAvailableLocations` with a specified project, a member
+must be at minimum a Viewer of the project. Calls without a specified
+project do not require any specific project permissions.
+
+Args:
+  parent: string, The Project for which to list GCP resource locations, in the format:
+&lt;br&gt;&lt;code&gt;projects/&lt;var&gt;projectId&lt;/var&gt;&lt;/code&gt;
+&lt;br&gt;If no project is specified (that is, `projects/-`), the returned list
+does not take into account org-specific or project-specific location
+restrictions. (required)
+  pageToken: string, Token returned from a previous call to `ListAvailableLocations` indicating
+where in the list of locations to resume listing.
+  pageSize: integer, The maximum number of locations to return in the response.
+&lt;br&gt;
+&lt;br&gt;The server may return fewer than this value at its discretion.
+If no value is specified (or too large a value is specified), then the
+server will impose its own limit.
+&lt;br&gt;
+&lt;br&gt;This value cannot be negative.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    {
+    &quot;nextPageToken&quot;: &quot;A String&quot;, # If the result list is too large to fit in a single response, then a token
+        # is returned. If the string is empty, then this response is the last page of
+        # results and all available locations have been listed.
+        # &lt;br&gt;
+        # &lt;br&gt;This token can be used in a subsequent call to
+        # `ListAvailableLocations` to find more locations.
+        # &lt;br&gt;
+        # &lt;br&gt;Page tokens are short-lived and should not be persisted.
+    &quot;locations&quot;: [ # One page of results from a call to `ListAvailableLocations`.
+      { # A GCP resource location that can be selected for a Project.
+        &quot;locationId&quot;: &quot;A String&quot;, # The ID of the GCP resource location. It will be one of the available [GCP
+            # resource
+            # locations](https://firebase.google.com/docs/projects/locations#types).
+        &quot;type&quot;: &quot;A String&quot;, # Indicates whether the GCP resource location is a [regional or
+            # multi-regional
+            # location](https://firebase.google.com/docs/projects/locations#types)
+            # for data replication.
+        &quot;features&quot;: [ # Products and services that are available in the GCP resource location.
+          &quot;A String&quot;,
+        ],
+      },
+    ],
+  }</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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