doc PG 18 relnotes: update to current

Bruce Momjian <bruce@momjian.us>

Commit: a60691eb201dfaa8a2c3aec8815d08ed3371aae7
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-07-30T02:27:01Z
Releases: 18.0
doc PG 18 relnotes:  update to current

Backpatch-through: 18 only

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doc/src/sgml/release-18.sgml modified +21 −4

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