docs: def read_files(*sources):
      """Construct a generator that yields :class:`~nmrstarlib.nmrstarlib.StarFile` instances.
  
      :param sources: One or more strings representing path to file(s).
      :return: :class:`~nmrstarlib.nmrstarlib.StarFile` instance(s).
      :rtype: :class:`~nmrstarlib.nmrstarlib.StarFile`
      """
      filenames = _generate_filenames(sources)
      filehandles = _generate_handles(filenames)
      for fh, source in filehandles:
          starfile = nmrstarlib.StarFile.read(fh, source)
          yield starfile