docs: PG 12 docs, clarify btree index changes

Bruce Momjian <bruce@momjian.us>

Commit: 809e248299894b02e8f4eb3ee17829b2ae14ce9d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-11T01:03:31Z
Releases: 12.0
docs:  PG 12 docs, clarify btree index changes

Reported-by: Peter Geoghegan

Discussion: https://postgr.es/m/CAH2-WzkSYOM1GJVGtAbRW-OqymoCD=QWYG6ro+GaoOW-jPRuDQ@mail.gmail.com

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doc/src/sgml/release-12.sgml modified +3 −1

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