Update glance policy management

Related: PROD-34318

Change-Id: I9be49b2af345baa713e44b58a5e37aa1601226f6
diff --git a/README.rst b/README.rst
index 456fc74..f15bff7 100644
--- a/README.rst
+++ b/README.rst
@@ -493,8 +493,8 @@
         ...
         show_multiple_locations: True
 
-Change default resource quotas using configmap template settings
-========
+Change default resource quotas using configmap template settings:
+-----------------------------------------------------------------
 
 .. code-block:: yaml
 
@@ -516,6 +516,20 @@
               image_location_quota: 10
               user_storage_quota: 0
 
+Change default service policy configuration:
+--------------------------------------------
+
+.. code-block:: yaml
+
+    glance:
+      server:
+        policy:
+          manage_image_cache: 'role:admin'
+          get_task: 'role:admin'
+          # Add key without value to remove line from policy.json
+          modify_member:
+
+
 Usage
 =====