doc: PG 16 relnotes, update "current as of" date

Bruce Momjian <bruce@momjian.us>

Commit: c5c8bd29b9a22a05f81857c6921c0bc615140cc5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-15T13:15:21Z
Releases: 16.0
doc:  PG 16 relnotes, update "current as of" date

Backpatch-through: 16 only

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

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