doc: update PG 16 relnotes for pg_walinspect changes

Bruce Momjian <bruce@momjian.us>

Commit: f79ee34702d485fb30427816b95e6c944660fc23
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-19T01:44:45Z
Releases: 16.0
doc:  update PG 16 relnotes for pg_walinspect changes

Reported-by: Peter Geoghegan

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doc/src/sgml/release-16.sgml modified +60 −68

Documentation touched