doc: PG 16 relnotes, mark current as of 2023-08-09

Bruce Momjian <bruce@momjian.us>

Commit: c8c033f721de1e25c90acf146fabee77c9dbf92e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-10T02:09:17Z
Releases: 16.0
doc: PG 16 relnotes, mark current as of 2023-08-09

Backpatch-through: 16 only

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

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