Log Message:
-----------
Add release notes for back branches (7.3 and up).
Also minor improvements to 8.1.1 release notes.
Modified Files:
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pgsql/doc/src/sgml:
release.sgml (r1.411 -> r1.412)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.411&r2=1.412)