doc: improve pg_walinspect and role membership items

Bruce Momjian <bruce@momjian.us>

Commit: 613a7eca9ca9f13d1f9fd8a7806bbded1836e58f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-19T03:17:03Z
Releases: 16.0
doc:  improve pg_walinspect and role membership items

Reported-by: Peter Geoghegan

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doc/src/sgml/release-16.sgml modified +3 −3

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