doc: Update error type in delete_endpoint docstring (#1241)

Author: ajaykarpur

src/sagemaker/estimator.py

@@ -796,7 +796,7 @@ def delete_endpoint(self):
         """Delete an Amazon SageMaker ``Endpoint``.
 
         Raises:
-            ValueError: If the endpoint does not exist.
+            botocore.exceptions.ClientError: If the endpoint does not exist.
         """
         self._ensure_latest_training_job(error_message="Endpoint was not created yet")
         self.sagemaker_session.delete_endpoint(self.latest_training_job.name)