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.

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/4a9b44d3c075fe73661d0407faf6f048075a00f9

Modified Files
--------------
doc/src/sgml/func.sgml | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

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