pgsql: Fix outdated comment in tuplesort.h - Mailing list pgsql-committers

Fix outdated comment in tuplesort.h

This was outdated by 77bae396d.

Backpatch-through: 15, where 77bae396d was added

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/23f44276123031d21cffeb699d9863149e1c734f

Modified Files
--------------
src/include/utils/tuplesort.h | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)