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_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/ab33ecc8887a62987d236c45b2f3a235a301b80d

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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