doc: fix description of backward_scan

Andrew Gierth <rhodiumtoad@postgresql.org>

Commit: ee68541ce60dd585cbc53142ab9cd14bf10fdf8f
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Date: 2018-05-17T20:23:01Z
Releases: 10.5
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