docs: PG 12 relnote wording fix

Bruce Momjian <bruce@momjian.us>

Commit: 3ceaed106d95e76c7dbfd41f5d83a163fd0d25c8
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-28T11:17:34Z
Releases: 12.0
docs:  PG 12 relnote wording fix

Reported-by: Gaby Schilders

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doc/src/sgml/release-12.sgml modified +1 −1

Documentation touched