message: Add missing closing paren in optimizer_v2 docs
diff: @@ -108,7 +108,7 @@ class OptimizerV2(trackable.Trackable):
  opt = tf.keras.optimizers.SGD(learning_rate=0.1)
  model = tf.keras.Sequential()
  model.add(tf.keras.layers.Dense(num_hidden, activation='relu'))
  - model.add(tf.keras.layers.Dense(num_classes, activation='sigmoid')
  + model.add(tf.keras.layers.Dense(num_classes, activation='sigmoid'))
  loss_fn = lambda: tf.keras.losses.mse(model(input), output)
  var_list_fn = lambda: model.trainable_weights
  for input, output in data:
  