docs: clarify pull_file docstring with failure example

Author: AlePouroullis

src/humanloop/sync/sync_client.py

@@ -206,7 +206,7 @@ def _pull_file(self, path: str, environment: Optional[str] = None) -> bool:
         """Pull a specific file from Humanloop to local filesystem.
 
         Returns:
-            True if the file was successfully pulled, False otherwise
+            True if the file was successfully pulled, False otherwise (e.g. if the file was not found)
         """
         try:
             file = self.client.files.retrieve_by_path(