doc: more PG 16 relnote wording improvements

Bruce Momjian <bruce@momjian.us>

Commit: d8a81108a87bd5e8e9ca136d3195e146a58b9e4d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-18T21:43:10Z
Releases: 16.0
doc:  more PG 16 relnote wording improvements

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doc/src/sgml/release-16.sgml modified +59 −50

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