docs: PG 12 release notes, support functions

Bruce Momjian <bruce@momjian.us>

Commit: 728840fe13acff7b03a4b1a813eeb8900ce5e469
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-22T15:22:13Z
Releases: 12.0
docs:  PG 12 release notes, support functions

Move support function mention to the proper section, and reword.

Reported-by: Tom Lane

Discussion: https://postgr.es/m/5121.1558472431@sss.pgh.pa.us

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doc/src/sgml/release-12.sgml modified +22 −23

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