pgsql: Per core discussion, we should push out a 7.2.* release too while

Log Message:
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Per core discussion, we should push out a 7.2.* release too while
we are at it. Add release notes.

Modified Files:
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pgsql/doc/src/sgml:
release.sgml (r1.334 -> r1.335)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.334&r2=1.335)