Update manila policy management

Related: PROD-34318

Change-Id: Ia848d707441b008588c80396120848c2dd30661b
diff --git a/README.rst b/README.rst
index 5871722..2ae16fa 100644
--- a/README.rst
+++ b/README.rst
@@ -45,6 +45,19 @@
           host: 10.20.0.102
 
 
+Change default service policy configuration:
+--------------------------------------------
+
+.. code-block:: yaml
+
+    manila:
+      api:
+        policy:
+          quota_class_set:update: 'rule:default'
+          service:update: 'rule:admin_or_owner'
+          # Add key without value to remove line from policy.json
+          share:create:
+
 Backend configuration
 =====================