doc: PG 16 relnotes, add psql \df+ source code change

Bruce Momjian <bruce@momjian.us>

Commit: 47b7051bc82f11f19df43544045c93549783e962
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-06-01T23:59:46Z
Releases: 16.0
doc:  PG 16 relnotes, add psql \df+ source code change

Reported-by: bzm@2bz.de

Discussion: https://postgr.es/m/17957-e1db8b1c15af444a@postgresql.org

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doc/src/sgml/release-16.sgml modified +15 −0

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