Fix boilerplate comments in btree_gist

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 9370978da8ac8f0e31867859282b0f2be724fe48
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2025-04-03T10:39:33Z
Releases: 18.0
Fix boilerplate comments in btree_gist

A few of these were copy-pasted wrong, like the comment "Bytea ops" in
btree_numeric.c. Instead of fixing the incorrect ones, replace them
all with generic comment "GiST support functions".

Also tidy up the inconsistent newlines between various functions while
we're at it.

Files