Log Message:
-----------
Update release notes for recent changes; also minor editorialization.
Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.310 -> r1.311)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.310&r2=1.311)