message: Fix guide/data doc link in release notes.
  The doc was moved from guide/datasets to guide/data.
diff: @@ -1259,7 +1259,7 @@ answered questions, and were part of inspiring discussions.
  ## Major Features And Improvements
  * `tf.keras` is now part of the core TensorFlow API.
  -* [`tf.data`](http://tensorflow.org/guide/datasets) is now part of
  +* [`tf.data`](http://tensorflow.org/guide/data) is now part of
  the core TensorFlow API.
  * The API is now subject to backwards compatibility guarantees.
  * For a guide to migrating from the `tf.contrib.data` API, see the
  