docs: docs update (#911)

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Fixes #<issue_number_goes_here> 🦕
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+
+<h1><a href="bigqueryreservation_v1alpha2.html">BigQuery Reservation API</a> . <a href="bigqueryreservation_v1alpha2.projects.html">projects</a> . <a href="bigqueryreservation_v1alpha2.projects.locations.html">locations</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="bigqueryreservation_v1alpha2.projects.locations.operations.html">operations()</a></code>
+</p>
+<p class="firstline">Returns the operations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="bigqueryreservation_v1alpha2.projects.locations.reservationGrants.html">reservationGrants()</a></code>
+</p>
+<p class="firstline">Returns the reservationGrants Resource.</p>
+
+<p class="toc_element">
+  <code><a href="bigqueryreservation_v1alpha2.projects.locations.reservations.html">reservations()</a></code>
+</p>
+<p class="firstline">Returns the reservations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#searchReservationGrants">searchReservationGrants(parent, query=None, pageToken=None, pageSize=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Look up grants for a specified resource for a particular region.</p>
+<p class="toc_element">
+  <code><a href="#searchReservationGrants_next">searchReservationGrants_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="searchReservationGrants">searchReservationGrants(parent, query=None, pageToken=None, pageSize=None, x__xgafv=None)</code>
+  <pre>Look up grants for a specified resource for a particular region.
+If the request is about a project:
+  1) Grants created on the project will be returned if they exist.
+  2) Otherwise grants created on the closest ancestor will be returned.
+  3) Grants for different JobTypes will all be returned.
+Same logic applies if the request is about a folder.
+If the request is about an organization, then grants created on the
+organization will be returned (organization doesn&#x27;t have ancestors).
+Comparing to ListReservationGrants, there are two behavior
+differences:
+  1) permission on the grantee will be verified in this API.
+  2) Hierarchy lookup (project-&gt;folder-&gt;organization) happens in this API.
+
+Args:
+  parent: string, The parent resource name (containing project and location), which owns the
+grants. e.g.:
+  &quot;projects/myproject/locations/us-central1&quot;. (required)
+  query: string, Please specify resource name as grantee in the query.
+e.g., &quot;grantee=projects/myproject&quot;
+      &quot;grantee=folders/123&quot;
+      &quot;grantee=organizations/456&quot;
+  pageToken: string, The next_page_token value returned from a previous List request, if any.
+  pageSize: integer, The maximum number of items to return.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # The response for ReservationService.SearchReservationGrants.
+    &quot;reservationGrants&quot;: [ # List of reservation grants visible to the user.
+      { # A ReservationGrant allows a project to submit jobs
+          # of a certain type using slots from the specified reservation.
+        &quot;grantee&quot;: &quot;A String&quot;, # The resource which will use the reservation. E.g.
+            # projects/myproject, folders/123, organizations/456.
+        &quot;jobType&quot;: &quot;A String&quot;, # Which type of jobs will use the reservation.
+        &quot;state&quot;: &quot;A String&quot;, # Output only. State of the ReservationGrant.
+        &quot;name&quot;: &quot;A String&quot;, # Output only. Name of the resource. E.g.:
+            # projects/myproject/locations/eu/reservationGrants/123.
+        &quot;reservation&quot;: &quot;A String&quot;, # Resource name of the reservation.
+            # E.g., projects/myproject/locations/eu/reservations/my_reservation.
+            # This reservation must be in the same location as the grant.
+            # This reservation should belong to the same parent project.
+      },
+    ],
+    &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.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="searchReservationGrants_next">searchReservationGrants_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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