doc PG 19 relnotes: update to current

Bruce Momjian <bruce@momjian.us>

Commit: 6b48f5d1a74168c78badfb2e59ef788bb8eb396e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2026-05-14T20:37:47Z
doc PG 19 relnotes:  update to current

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doc/src/sgml/release-19.sgml modified +16 −1