Updata app.py

app.py

@@ -14,9 +14,9 @@ def countries_with_same_current_offset(timezone : str, return_country_names : bo
     Return a list of all countries that have the same current UTC offset
     as the given timezone_name.
     Args :
-        timezone: A string, e.g. 'America/New_York'
-        return_country_names: If True, return a list of country names;
-                                If False, return ISO country codes.
+        timezone: A string representing a valid timezone (e.g., 'America/New_York').
+        return_country_names: If True, return a list of country names; If False, return ISO country codes.
+        
     :return: A list of matching country names or ISO country codes.
     """
     # Current UTC time