doc: PG 16 relnotes, small wording improvement

Bruce Momjian <bruce@momjian.us>

Commit: 0752461d3a1114d560225fae7522dde0ab544b63
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-10T00:37:41Z
Releases: 16.0
doc:  PG 16 relnotes, small wording improvement

Backpatch-through: 16 only

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doc/src/sgml/release-16.sgml modified +1 −1

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