Log Message:
-----------
Add descriptions to TODO items and make adjustments based on 7.5.
Modified Files:
--------------
pgsql-server/doc:
TODO (r1.1311 -> r1.1312)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/TODO.diff?r1=1.1311&r2=1.1312)