docs: def post_freeze_hook(self):
          """Post :meth:`dtoolcore.ProtoDataSet.freeze` cleanup actions.
  
          This method is called at the end of the
          :meth:`dtoolcore.ProtoDataSet.freeze` method.
  
          In the :class:`dtoolcore.storage_broker.DiskStorageBroker` it removes
          the temporary directory for storing item metadata fragment files.
          """
          if os.path.isdir(self._metadata_fragments_abspath):
              shutil.rmtree(self._metadata_fragments_abspath)