doc: PG 12 relnotes - add item about amcheck index root check

Bruce Momjian <bruce@momjian.us>

Commit: ba2347a6d985afc19d4c8e8e84b16a28ed4df137
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-07-26T01:37:04Z
Releases: 12.0
doc:  PG 12 relnotes - add item about amcheck index root check

Reported-by: Peter Geoghegan

Discussion: https://postgr.es/m/LGbT2ncB7tiDsndK0eXHTKmogLjJ5rO52HqXigP8bCA@mail.gmail.com

Backpatch-through: 12

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doc/src/sgml/release-12.sgml modified +12 −0

Documentation touched