Is there any difference between Checkpointed and CheckpointedAsynchronously?

[Tao Meng]

Hi all,
   When I read the source code about checkpoint, I can't find any
difference between Checkpointed and CheckpointedAsynchronously. I can not
sure that I am correct. The doc about `Asynchronous State Snapshots`
is commented out in markdown file.
  I want to know if I am right (there no difference between checkpointed
and checkpintedAsynchronously in release versions.)