documentation: Fix Redshift/Athena dataset_definition links

Author: tuliocasagrande

src/sagemaker/dataset_definition/inputs.py

@@ -99,9 +99,9 @@ class DatasetDefinition(ApiObject):
             Definition inputs to run a processing job. LocalPath is an absolute path to the input
             data. This is a required parameter when `AppManaged` is False (default).
         redshift_dataset_definition
-            (:class:`~sagemaker.dataset_definition.RedshiftDatasetDefinition`): Redshift
+            (:class:`~sagemaker.dataset_definition.inputs.RedshiftDatasetDefinition`): Redshift
             dataset definition.
-        athena_dataset_definition (:class:`~sagemaker.dataset_definition.AthenaDatasetDefinition`):
+        athena_dataset_definition (:class:`~sagemaker.dataset_definition.inputs.AthenaDatasetDefinition`):
             Configuration for Athena Dataset Definition input.
     """