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
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ee68541ce60dd585cbc53142ab9cd14bf10fdf8f

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

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