message: [tf.data] Fix the "Returns" section in the `Dataset.unbatch()` docstring.
diff: @@ -1951,8 +1951,7 @@ name=None))
  [1, 2, 3, 1, 2, 1, 2, 3, 4]
  Returns:
  - A `Dataset` transformation function, which can be passed to
  - `tf.data.Dataset.apply`.
  + A `Dataset`.
  """
  # NOTE(mrry): We must ensure that any non-tensor components in `dataset`
  