Improve covering index documentation

Teodor Sigaev <teodor@sigaev.ru>

Commit: 03c11796a95cc20a4559a103019d4d22a116a13c
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2018-04-09T14:53:42Z
Releases: 11.0
Improve covering index documentation

Add missed description of pg_constraint.conincluding

Shinoda, Noriyoshi and Alexander Korotkov

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doc/src/sgml/catalogs.sgml modified +8 −0

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