pgsql: Add paragraph about ON CONFLICT interaction with partitioning.

Add paragraph about ON CONFLICT interaction with partitioning.

Author: Peter Geoghegan and Andres Freund
Discussion: CAM3SWZScpWzQ-7EJC77vwqzZ1GO8GNmURQ1QqDQ3wRn7AbW1Cg@mail.gmail.com,
CAHGQGwFUCWwSU7dtc2aRdRk73ztyr_jY5cPOyts+K8xKJ92X4Q@mail.gmail.com
Backpatch: 9.5, where UPSERT was introduced

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/90e074baec2f052120271437a72d2ef6d1de1696

Modified Files
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doc/src/sgml/ddl.sgml | 9 +++++++++
1 file changed, 9 insertions(+)

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