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.availableProjects.html">availableProjects</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(pageToken=None, pageSize=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns a list of [Google Cloud Platform (GCP) `Projects`]</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(pageToken=None, pageSize=None, x__xgafv=None)</code>
+  <pre>Returns a list of [Google Cloud Platform (GCP) `Projects`]
+(https://cloud.google.com/resource-manager/reference/rest/v1/projects)
+that are available to have Firebase resources added to them.
+&lt;br&gt;
+&lt;br&gt;A GCP `Project` will only be returned if:
+&lt;ol&gt;
+  &lt;li&gt;&lt;p&gt;The caller has sufficient
+         [Google IAM](https://cloud.google.com/iam) permissions to call
+         AddFirebase.&lt;/p&gt;&lt;/li&gt;
+  &lt;li&gt;&lt;p&gt;The GCP `Project` is not already a FirebaseProject.&lt;/p&gt;&lt;/li&gt;
+  &lt;li&gt;&lt;p&gt;The GCP `Project` is not in an Organization which has policies
+         that prevent Firebase resources from being added.&lt;/p&gt;&lt;/li&gt;
+&lt;/ol&gt;
+
+Args:
+  pageToken: string, Token returned from a previous call to `ListAvailableProjects`
+indicating where in the set of GCP `Projects` to resume listing.
+  pageSize: integer, The maximum number of GCP `Projects` 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), 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.
+        # &lt;br&gt;
+        # &lt;br&gt;This token can be used in a subsequent calls to `ListAvailableProjects`
+        # to find the next group of GCP `Projects`.
+        # &lt;br&gt;
+        # &lt;br&gt;Page tokens are short-lived and should not be persisted.
+    &quot;projectInfo&quot;: [ # The list of GCP `Projects` which can have Firebase resources added to them.
+      { # A reference to a Google Cloud Platform (GCP) `Project`.
+        &quot;displayName&quot;: &quot;A String&quot;, # The user-assigned display name of the GCP `Project`, for example:
+            # &lt;code&gt;My App&lt;/code&gt;
+        &quot;locationId&quot;: &quot;A String&quot;, # The ID of the project&#x27;s default GCP resource location. The location is one
+            # of the available
+            # [GCP resource
+            # locations](https://firebase.google.com/docs/projects/locations). &lt;br&gt; &lt;br&gt;
+            # Not all projects will have this field populated. If it is not populated, it
+            # means that the project does not yet have a default GCP resource location.
+            # To set your project&#x27;s default GCP resource location, call
+            # [`FinalizeDefaultLocation`](../projects.defaultLocation/finalize) after you
+            # add Firebase resources to your project.
+        &quot;project&quot;: &quot;A String&quot;, # The resource name of the GCP `Project` to which Firebase resources can be
+            # added, in the format:
+            # &lt;br&gt;&lt;code&gt;projects/&lt;var&gt;projectId&lt;/var&gt;&lt;/code&gt;
+      },
+    ],
+  }</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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