add doc string to get_latest_version

Author: Eli Davidson

CHANGELOG.md

@@ -6502,7 +6502,7 @@
 
 ### Documentation changes
 
- * add mandatory sagemaker_role argument to Local mode example. 
+ * add mandatory sagemaker_role argument to Local mode example.
 
 ## v1.18.6 (2019-03-20)
 

src/sagemaker/jumpstart/utils.py

@@ -1633,6 +1633,8 @@ def get_draft_model_content_bucket(provider: Dict, region: str) -> str:
 
 
 def get_latest_version(versions: List[str]) -> Optional[str]:
+    """Returns the latest version using sem-ver.
+      falls-back to string ordering when not using sem-ver."""
     try:
         return None if not versions else max(versions, key=Version)
     except InvalidVersion: