Update howto-manage-users-roles-with-rest-api.md

Updating to include that the roles will be at the application level and not organization level per feedback from support ticket

Author: Adaeze934

articles/iot-central/core/howto-manage-users-roles-with-rest-api.md

@@ -56,6 +56,7 @@ The response to this request looks like the following example that includes the
     }
   ]
 }
+Please note that this command only shows roles that are associated with an application and not a custom organization level role.
 ```
 
 ## Manage users