Update docstring examples to use lowercase type values

Changed the example values for 'Type' in the docstring of the permission check method to use lowercase (e.g., 'user', 'action', 'agent') for consistency and clarity.

Author: loveyana

veadk/integrations/ve_identity/identity_client.py

@@ -704,9 +704,9 @@ def check_permission(
         """Check if the principal has permission to perform the operation on the resource.
 
         Args:
-            principal: Principal information, e.g., {"Type": "User", "Id": "user123"}
-            operation: Operation to check, e.g., {"Type": "Action", "Id": "invoke"}
-            resource: Resource information, e.g., {"Type": "Agent", "Id": "agent456"}
+            principal: Principal information, e.g., {"Type": "user", "Id": "user123"}
+            operation: Operation to check, e.g., {"Type": "action", "Id": "invoke"}
+            resource: Resource information, e.g., {"Type": "agent", "Id": "agent456"}
             original_callers: Optional list of original callers.
             namespace: Namespace of the resource. Defaults to "default".