message: Mention other default learning rate changes in 1.14 relnotes
diff: * Transitive dependencies on :pooling_ops were removed. Some users may need to
  add explicit dependencies on :pooling_ops if they reference the operators
  from that library.
  -* tf.keras.optimizers.Adadelta default learning rate changed from 1.0 to .001
  +* tf.keras.optimizers default learning rate changes:
  + * Adadelta: 1.000 to 0.001
  + * Adagrad: 0.01 to 0.001
  + * Adamax: 0.002 to 0.001
  + * NAdam: 0.002 to 0.001
  ## Bug Fixes and Other Changes
  