fix: update docstring to clarify script functionality for fetching questions and downloading files

utilities/fetch_all_questions.py

@@ -3,6 +3,12 @@ import os
 import json
 from dotenv import load_dotenv
 
+''' This script fetches all questions from the API and downloads associated files.
+    It saves the questions to a JSON file and downloads the files to a local 
+    directory with name "downloaded_files".
+    Questions are saved in "new_gaia_questions.json".
+    '''
+
 load_dotenv()
 
 BASE_URL = os.getenv("BASE_URL")