Add double backticks in docstring.

Co-authored-by: Niko Sirmpilatze <[email protected]>

datashuttle/datashuttle.py

@@ -1459,7 +1459,7 @@ def _update_settings_with_new_canonical_keys(self, settings: Dict):
 
     def _check_top_level_folder(self, top_level_folder):
         """
-        Raise an error if `top_level_folder` not correct.
+Raise an error if ``top_level_folder`` not correct.
         """
         canonical_top_level_folders = canonical_folders.get_top_level_folders()