doc: fix description of backward_scan

Andrew Gierth <rhodiumtoad@postgresql.org>

Commit: 93f6c6328dcf74d1e42162e8f712c23fe16a8cf8
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Date: 2018-05-17T20:23:48Z
Releases: 11.0
doc: fix description of backward_scan

The description of the index property backward_scan was incorrect and
misleading; rectify.

Backpatch to 9.6 where the amutils functionality was introduced.

Files

PathChange+/−
doc/src/sgml/func.sgml modified +3 −1

Documentation touched