pgsql: Add description to: * Add deferred trigger queue file < This

Log Message:
-----------
Add description to:

* Add deferred trigger queue file

< This item involves dumping large queues into files.

This item involves dumping large queues into files, or doing some
kind of join to process all the triggers, or some bulk operation.

Modified Files:
--------------
pgsql/doc:
TODO (r1.2461 -> r1.2462)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2461&amp;r2=1.2462)
pgsql/doc/src/FAQ:
TODO.html (r1.967 -> r1.968)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.967&amp;r2=1.968)