doc: PG 16 relnotes, improve desc. of pg_log_standby_snapshot()

Bruce Momjian <bruce@momjian.us>

Commit: 4123455a9e5463495a6e9be8423e671c874ec19f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-22T14:21:20Z
Releases: 16.0
doc:  PG 16 relnotes, improve desc. of pg_log_standby_snapshot()

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

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