doc: PG 16 relnotes, misc merged items and bootstrap detail

Bruce Momjian <bruce@momjian.us>

Commit: de7c3fd34e0fc0a3f77537e1d12efcd01d255534
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-22T02:52:42Z
Releases: 16.0
doc: PG 16 relnotes, misc merged items and bootstrap detail

Reported-by: Andres Freund, jian he

Discussion: https://postgr.es/m/20230521171341.jjxykfsefsek4kzj@awork3.anarazel.de, 20230521171341.jjxykfsefsek4kzj@awork3.anarazel.de

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doc/src/sgml/release-16.sgml modified +14 −29

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