pgsql: Document use of partial indexes for partial unique constraints

Document use of partial indexes for partial unique constraints

Report by Tomáš Greif

Backpatch through 9.4

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/646deb603e0846d1efd4da84df412963dda68eec

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

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