message: update the note on dataset.skip()
diff: @@ -65,9 +65,9 @@ class DatasetBenchmarkBase(test.Benchmark):
  dataset = dataset.with_options(options)
  # NOTE: We use `dataset.skip()` to perform the iterations in C++, avoiding
  - # the overhead of multiple `session.run()` calls (in graph mode). Note that
  - # this relies on the underlying implementation of `skip`: if it is optimized
  - # in the future, we will have to change this code.
  + # the overhead of having to execute a TensorFlow op for each step of the input
  + # pipeline. Note that this relies on the underlying implementation of `skip`.
  + # If it is optimized in the future, we will have to change this code.
  dataset = dataset.skip(num_elements - 1)
  if context.executing_eagerly():
  