Fix comment related to pg_cryptohash_error()
One of the comments introduced in
b69aba7 was worded a bit weirdly, so
improve it.
Reported-by: Sergey Shinderuk
Discussion: https://postgr.es/m/
71b9a5d2-a3bf-83bc-a243-
93dcf0bcfb3b@postgrespro.ru
Backpatch-through: 14