message: PSv2/cfit: Update the doc with the supported path of ParameterServerStrategy with Model.fit in RELEASE.md.
  Commits implementing this change: (
  https://github.com/tensorflow/tensorflow/search?q=%22PSv2%2Fcfit%22&type=commits)
diff: `DatasetCreator` is intended to work across all `tf.distribute`
  strategies, and is the only input type supported for Parameter Server
  strategy.
  +* `tf.distribute`
  + * `tf.distribute.experimental.ParameterServerStrategy` now supports
  + training with Keras `Model.fit` when used with `DatasetCreator`.
  ## Bug Fixes and Other Changes
  