Ultralytics Code Refactor https://ultralytics.com/actions (#156)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

hub_sdk/base/api_client.py

@@ -31,6 +31,7 @@ def __init__(self, message: str, status_code: Optional[int] = None):
         self.message = message
 
     def __str__(self) -> str:
+        """Returns a string representation of the APIClientError instance."""
         return f"{self.__class__.__name__}: {self.args[0]}"