Fix function name in comment
The name of the function resulting from the macro expansion was
incorrectly stated.
Backpatch to 16 where it was introduced.
Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/
20231101.172308.
1740861597185391383.horikyota.ntt@gmail.com
Backpatch-through: v16