pgsql: Fix typo in comment

Fix typo in comment

The function was renamed in 908e23473, but the comment never learned
about it.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/60de884be75cafec97cb15e60e63f72cb9035549

Modified Files
--------------
src/backend/utils/adt/jsonfuncs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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