doc: adjustments for PG 12 release notes

Bruce Momjian <bruce@momjian.us>

Commit: 32fe2e3194c7198ca4afdb6bea4ffa12466612b1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-21T20:14:33Z
Releases: 12.0
doc:  adjustments for PG 12 release notes

Mostly commit messages, attribution, and text, all suggested by Andres
Freund.

Discussion: https://postgr.es/m/20190520221719.pqgld3krjc2docr5@alap3.anarazel.de

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doc/src/sgml/release-12.sgml modified +23 −13

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