Log Message:
-----------
Update release history for releases 7.4.6, 7.3.8, 7.2.6.
Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.301 -> r1.302)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.301&r2=1.302)