out of date comment in commit_ts.c

Hi hackers,

I noticed that commit_ts.c has the following comment:

* XLOG interactions: this module generates an XLOG record whenever a new
* CommitTs page is initialized to zeroes. Also, one XLOG record is
* generated for setting of values when the caller requests it; this allows
* us to support values coming from places other than transaction commit.
* Other writes of CommitTS come from recording of transaction commit in
* xact.c, which generates its own XLOG records for these events and will
* re-perform the status update on redo; so we need make no additional XLOG
* entry here.

IIUC the ability for callers to request WAL record generation is no longer
possible as of 08aa89b [0]. Should the second sentence be removed?

[0] https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=08aa89b

--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com