doc PG 18 relnotes: update chapter tags for recent commit

Bruce Momjian <bruce@momjian.us>

Commit: 9fd989ff9937966a8c3f28bfb6cce8f8071b3289
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-05-03T00:10:10Z
Releases: 18.0
doc PG 18 relnotes:  update chapter tags for recent commit

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