message: Updating documentation for tf.train.latest_checkpoint.
diff: @@ -321,11 +321,21 @@ def _prefix_to_checkpoint_path(prefix, format_version):
  def latest_checkpoint(checkpoint_dir, latest_filename=None):
  """Finds the filename of latest saved checkpoint file.
  + Gets the checkpoint state given the provided checkpoint_dir and looks for a
  + corresponding TensorFlow 2 (preferred) or TensorFlow 1.x checkpoint path.
  + The latest_filename argument is only applicable if you are saving checkpoint
  + using `v1.Saver.save`
  +
  +
  + See the [Training Checkpoints
  + Guide](https://www.tensorflow.org/guide/checkpoint) for more details and
  + examples.`
  +
  Args:
  checkpoint_dir: Directory where the variables were saved.
  latest_filename: Optional name for the protocol buffer file that
  contains the list of most recent checkpoint filenames.
  - See the corresponding argument to `Saver.save()`.
  + See the corresponding argument to `v1.Saver.save`.
  Returns:
  The full path to the latest checkpoint or `None` if no checkpoint was found.
  