doc PG 19 relnotes: update to current, merge items

Bruce Momjian <bruce@momjian.us>

Commit: 4ebae546accf6ff0daee2f171f5d6907771b76f6
Author: Bruce Momjian <bruce@momjian.us>
Date: 2026-06-05T18:05:01Z
doc PG 19 relnotes:  update to current, merge items

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doc/src/sgml/release-19.sgml modified +8 −14