docs: def cache(cache_directory_path):
      """Display / set / update the dtool cache directory."""
      if not cache_directory_path:
          click.secho(dtool_config.utils.get_cache(
              CONFIG_PATH,
          ))
      else:
          click.secho(dtool_config.utils.set_cache(
              CONFIG_PATH,
              cache_directory_path
          ))