message: Update `model.fit` API docstrings to indicate which callbacks need not be
  passed into `model.fit`.
diff: @@ -868,7 +868,11 @@ class Model(base_layer.Layer, version_utils.ModelVersionSelector):
  interactively (eg, in a production environment).
  callbacks: List of `keras.callbacks.Callback` instances.
  List of callbacks to apply during training.
  - See `tf.keras.callbacks`.
  + See `tf.keras.callbacks`. Note `tf.keras.callbacks.ProgbarLogger`
  + and `tf.keras.callbacks.History` callbacks are created automatically
  + and need not be passed into `model.fit`.
  + `tf.keras.callbacks.ProgbarLogger` is created or not based on
  + `verbose` argument to `model.fit`.
  validation_split: Float between 0 and 1.
  Fraction of the training data to be used as validation data.
  The model will set apart this fraction of the training data,
  