message: Added a warning about AutoTrackable
diff: @@ -722,6 +722,9 @@ class Saver(object):
  saver = tf.compat.v1.train.Saver({v.op.name: v for v in [v1, v2]})
  ```
  + Note: the newer `AutoTrackable` API is not supported by `Saver`. In this
  + case, the `tf.train.Checkpoint` class should be used.
  +
  The optional `reshape` argument, if `True`, allows restoring a variable from
  a save file where the variable had a different shape, but the same number
  of elements and type. This is useful if you have reshaped a variable and
  