doc PG 18 relnotes: set release date, remove "CURRENT AS OF"

Bruce Momjian <bruce@momjian.us>

Commit: 144de0341bde9cab7a6b629a3d9041be54486d96
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-09-18T15:29:36Z
Releases: 18.0
doc PG 18 relnotes:  set release date, remove "CURRENT AS OF"

Backpatch-through: 18 only

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doc/src/sgml/release-18.sgml modified +1 −1

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