doc: PG 12 relnotes, correct recovery_target* variable mention

Bruce Momjian <bruce@momjian.us>

Commit: ba95a6933632410d103d6f17cd3bc1adf92a08f9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-22T14:54:40Z
Releases: 12.0
doc:  PG 12 relnotes,  correct recovery_target* variable mention

Clarify new restriction on recovery_target* variables.

Reported-by: Gaby Schilders

Discussion: reported via chat

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doc/src/sgml/release-12.sgml modified +9 −4

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