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_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1477f39cafa98bccbec897af832ede250e180036

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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