message: Add upgrade instructions to the `tf.contrib` doc-string.
diff: # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==============================================================================
  -"""contrib module containing volatile or experimental code."""
  +"""Contrib module containing volatile or experimental code.
  +
  +Warning: The `tf.contrib` module will not be included in TensorFlow 2.0. Many
  +of its submodules have been integrated into TensorFlow core, or spun-off into
  +other projects like [`tensorflow_io`](https://github.com/tensorflow/io), or
  +[`tensorflow_addons`](https://github.com/tensorflow/addons). For instructions
  +on how to upgrade see the
  +[Migration guide](https://www.tensorflow.org/beta/guide/migration_guide).
  +"""
  from __future__ import absolute_import
  from __future__ import division
  