pgsql: Improve ON CONFLICT documentation.

Improve ON CONFLICT documentation.

Author: Peter Geoghegan and Andres Freund
Discussion: CAM3SWZScpWzQ-7EJC77vwqzZ1GO8GNmURQ1QqDQ3wRn7AbW1Cg@mail.gmail.com
Backpatch: 9.5, where ON CONFLICT was introduced

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/edf68b2ed51cb8a1c9fdf7eb13f9b2c883eb5399

Modified Files
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doc/src/sgml/ref/insert.sgml | 743 +++++++++++++++++++++---------------------
1 file changed, 378 insertions(+), 365 deletions(-)

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