message: [data-stats] Fixes the document.
  RELNOTES: n/a
diff: @@ -44,7 +44,7 @@ class StatsAggregator(object):
  dataset = ...
  # Apply `StatsOptions` to associate `dataset` with `aggregator`.
  - options = dataset_ops.Options()
  + options = tf.data.Options()
  options.experimental_stats.aggregator = aggregator
  dataset = dataset.with_options(options)
  ```
  