doc: PG 12 relnotes: update wording on truncate/vacuum item

Bruce Momjian <bruce@momjian.us>

Commit: 4f41a7227511a3f96148b7f3d4ae6f0c350bc7b2
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-06-13T13:15:59Z
Releases: 12.0
doc:  PG 12 relnotes:  update wording on truncate/vacuum item

This item prevents unauthorized locking of relations, and the previous
wording was unclear.

Reported-by: Michael Paquier

Discussion: https://postgr.es/m/20190522072651.GC1278@paquier.xyz

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doc/src/sgml/release-12.sgml modified +4 −2

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