doc: PG 16 relnotes: udpate for commits since branching

Bruce Momjian <bruce@momjian.us>

Commit: 03fb43f6ed63fd2d52bf8ec305893a31ef0a38e5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-14T21:28:39Z
Releases: 16.0
doc: PG 16 relnotes:  udpate for commits since branching

Backpatch-through: 16 only

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doc/src/sgml/release-16.sgml modified +15 −2

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