pgsql: Update: < * Flush cached query plans when the dependent objects

Log Message:
-----------
Update:

< * Flush cached query plans when the dependent objects change

* Flush cached query plans when the dependent objects change or
when the cardinality of parameters changes dramatically

Modified Files:
--------------
pgsql/doc:
TODO (r1.1728 -> r1.1729)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1728&amp;r2=1.1729)
pgsql/doc/src/FAQ:
TODO.html (r1.233 -> r1.234)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.233&amp;r2=1.234)