pgsql: docs: remove outdated note about unique indexes

docs: remove outdated note about unique indexes

Patch by Josh Kupershmidt

Backpatch through 9.5

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/06502185d8352258560b7fad82571d159dff8658

Modified Files
--------------
doc/src/sgml/indices.sgml | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

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