doc: PG 16 relnotes, delete reverted grant, adjust version num

Bruce Momjian <bruce@momjian.us>

Commit: e5f85744eaa5ca83ff4d27509ed094ca33ed485e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-19T16:30:14Z
Releases: 16.0
doc:  PG 16 relnotes, delete reverted grant, adjust version num

Reported-by: Nathan Bossart, Sehrope Sarkuni

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doc/src/sgml/release-16.sgml modified +3 −14

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