doc PG 18 relnotes: update to current, add one commit

Bruce Momjian <bruce@momjian.us>

Commit: fa638edc74ee4be90e94a45f8489f3be9a926d7e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-06-21T03:53:15Z
Releases: 18.0
doc PG 18 relnotes:  update to current, add one commit

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doc/src/sgml/release-18.sgml modified +5 −2

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