doc PG 18 relnotes: add markup, still need to add links

Bruce Momjian <bruce@momjian.us>

Commit: bb43c97babdf09efbd97bb535d2acb522678f977
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-06-18T00:00:38Z
Releases: 18.0
doc PG 18 relnotes:  add markup, still need to add links

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doc/src/sgml/release-18.sgml modified +274 −271

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