docs: def join_strings(key, value, fmt, meta):  # pylint: disable=unused-argument
      """Joins adjacent Str elements in the 'value' list."""
      if key in ['Para', 'Plain']:
          _join_strings(value)
      elif key == 'Image':
          _join_strings(value[-2])
      elif key == 'Table':
          _join_strings(value[-5])