Fix ruff linter errors

Author: aneeshgarg

src/a2a/client/client_task_manager.py

@@ -15,6 +15,7 @@
 )
 from a2a.utils import append_artifact_to_task
 
+
 logger = logging.getLogger(__name__)
 
 

src/a2a/client/errors.py

@@ -81,9 +81,7 @@ def __init__(self, error: JSONRPCErrorResponse):
         """Initializes the A2AClientJsonRPCError.
 
         Args:
-            code: The error code.
-            message: A descriptive error message.
-            data: Optional additional error data.
+            error: The JSON-RPC error object.
         """
         self.error = error.error
         super().__init__(f'JSON-RPC Error {error.error}')