message: Update missing comma (keras guideline)
  Update missing comma on sample code (Section: Create a model using high-level tf.keras.* APIs)
diff: @@ -92,7 +92,7 @@ import tensorflow as tf
  # Create a model using high-level tf.keras.* APIs
  model = tf.keras.models.Sequential([
  - tf.keras.layers.Dense(units=1, input_shape=[1])
  + tf.keras.layers.Dense(units=1, input_shape=[1]),
  tf.keras.layers.Dense(units=16, activation='relu'),
  tf.keras.layers.Dense(units=1)
  ])
  