doc: Update header file mention for CompareType

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: b39013b7b1b116b5d9be51f0919b472b58b3a28d
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2025-12-16T08:46:53Z
doc: Update header file mention for CompareType

Commit 119fc30 moved CompareType to cmptype.h but the mention in
the docs still refered to primnodes.h

Author: Daisuke Higuchi <higuchi.daisuke11@gmail.com>
Reviewed-by: Paul A Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/CAEVT6c8guXe5P=L_Un5NUUzCgEgbHnNcP+Y3TV2WbQh-xjiwqA@mail.gmail.com
Backpatch-through: 18

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doc/src/sgml/gist.sgml modified +2 −2

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