chore: update marl_eval/json_tools/json_utils.py docstring

Co-authored-by: Sasha <[email protected]>

marl_eval/json_tools/json_utils.py

@@ -120,7 +120,7 @@ def pull_neptune_data(
     Args:
         project_name (str): Name of the Neptune project.
         tag (List): List of tags for the experiment(s) that contain the desired JSON files.
-        store_directory (str, optional): Directory to store the data.
+        store_directory (str, optional): Directory to store the data. Default: ./downloaded_json_data.
         neptune_data_key (str, optional): Key in the neptune run where the json data is stored. Default: metrics.
     """
     # Get the run ids