Remove INCLUDE attributes section from docs.

Peter Geoghegan <pg@bowt.ie>

Commit: 514d4a1338d5409431d644eaf453193ac362ef16
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2018-06-16T22:28:50Z
Releases: 11.0
Remove INCLUDE attributes section from docs.

Discussing covering indexes in a chapter that is mostly about the
behavior of B-Tree operator classes is unnecessary.  The CREATE INDEX
documentation's handling of covering indexes seems sufficient.

Discussion: https://postgr.es/m/CAH2-WzmpU=L_6VjhhOAMfoyHLr-pZd1kDc+jpa3c3a8EOmtcXA@mail.gmail.com

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doc/src/sgml/btree.sgml modified +0 −17

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