doc: PG 16 relnotes: clarify LOCK TABLE description

Bruce Momjian <bruce@momjian.us>

Commit: 22297cd65fa5efeffebcfaebfdda174dcdbd821a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-31T19:14:18Z
Releases: 16.0
doc:  PG 16 relnotes:  clarify LOCK TABLE description

Backpatch-through: 16 only

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doc/src/sgml/release-16.sgml modified +8 −7

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