message: Change a typo in sample code.
diff: @@ -164,7 +164,7 @@ class Loss(object):
  '`tf.keras.losses.Reduction.SUM_OVER_BATCH_SIZE` using global batch '
  'size like:\n```\nwith strategy.scope():\n'
  ' loss_obj = tf.keras.losses.CategoricalCrossentropy('
  - 'reduction=tf.keras.losses.reduction.NONE)\n....\n'
  + 'reduction=tf.keras.losses.Reduction.NONE)\n....\n'
  ' loss = tf.reduce_sum(loss_obj(labels, predictions)) * '
  '(1. / global_batch_size)\n```\nPlease see '
  'https://www.tensorflow.org/alpha/tutorials/distribute/training_loops'
  