message: remove trainable arg
diff: @@ -116,7 +116,6 @@ class FunctionalPreprocessingStage(base_preprocessing_layer.PreprocessingLayer,
  nested structure of tensors.
  Example:
  -
  ```
  from tensorflow.keras.layers.experimental import preprocessing
  inputs = {'x2': tf.keras.Input(shape=(5,)),
  @@ -133,8 +132,6 @@ class FunctionalPreprocessingStage(base_preprocessing_layer.PreprocessingLayer,
  outputs: An output tensor, or a list, a dict or a nested structure of
  output tensors.
  name: String, optional. Name of the preprocessing stage.
  - trainable: Boolean, whether the variables of non-preprocessing layers
  - in the stage should be trainable.
  """
  def fit(self, *args, **kwargs):
  