rephrased instructions for all policy module removal

Signed-off-by: zeshanziya <zeshan.ziya@axelerant.com>

docs/permissions/getting-started.md

@@ -81,7 +81,7 @@ To help validate the permission framework is setup we'll create a Test Permissio
    });
    ```
 
-6. We now need to register this in the backend. We will do this by adding the follow line:
+6. We now need to register this in the backend. We will do this by adding the new module and remove the existing allow all policy module as we can't have two modules setting the policy:
 
    ```ts title="packages/backend/src/index.ts"
    // permission plugin