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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master

Details
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http://git.postgresql.org/pg/commitdiff/1c7861e81b4220364bef75d2445e9c0619f3f3f8

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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