doc: PG 16 relnotes, add major features list

Bruce Momjian <bruce@momjian.us>

Commit: 60751aa50313b3498de199a3cd62e5f30e6b6091
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-22T17:58:24Z
Releases: 16.0
doc: PG 16 relnotes, add major features list

Reported-by: Jonathan Katz

Discussion: https://postgr.es/m/2fd2cc0e-df39-3e77-8fcf-35aad5796b0a@postgresql.org

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doc/src/sgml/release-16.sgml modified +44 −2

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