chore: update docstrings

Author: evakravi

src/sagemaker/jumpstart/estimator.py

@@ -712,6 +712,10 @@ def attach(
         Returns:
             Instance of the calling ``JumpStartEstimator`` Class with the attached
             training job.
+
+        Raises:
+            ValueError: if the model ID or version cannot be inferred from the training job.
+
         """
 
         if model_id is None:

src/sagemaker/predictor.py

@@ -67,7 +67,8 @@ def retrieve_default(
         Predictor: The default predictor to use for the model.
 
     Raises:
-        ValueError: If the combination of arguments specified is not supported.
+        ValueError: If the combination of arguments specified is not supported, or if a model ID or
+            version cannot be inferred from the endpoint.
     """
 
     if model_id is None: