doc PG 18 relnotes: update to current

Bruce Momjian <bruce@momjian.us>

Commit: e1dacaac3b9f95b10c24726dee4a15d817ca04e4
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-08-29T19:54:47Z
Releases: 18.0
doc PG 18 relnotes:  update to current

Backpatch-through: 18 only

Files

PathChange+/−
doc/src/sgml/release-18.sgml modified +9 −7

Documentation touched