pgsql: Doc: add a section in Part II concerning RETURNING.

Doc: add a section in Part II concerning RETURNING.

There are assorted references to RETURNING in Part II, but nothing
that would qualify as an explanation of the feature, which seems
like an oversight considering how useful it is. Add something.

Noted while looking for a place to point a cross-reference to ...

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/57995544497ce7e62552ce55ecdf6eca90198788

Modified Files
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doc/src/sgml/dml.sgml | 99 +++++++++++++++++++++++++++++++++++++++++++++++
doc/src/sgml/queries.sgml | 3 +-
2 files changed, 101 insertions(+), 1 deletion(-)

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