pgsql: Fix FK comment think-o

Fix FK comment think-o

from commit d6f96ed94e7

Author: Paul Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Ian Lawrence Barwick <barwick@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/6a7c7338-1aa2-4689-d171-0b0b294fdd84%40illuminatedcomputing.com

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/6bcd1d9f30c00fda59cd5210fc368bc086db15f6

Modified Files
--------------
src/backend/commands/tablecmds.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)