pgsql: Add: > > * Consider increasing the number of default statistics

Log Message:
-----------
Add:

* Consider increasing the number of default statistics target, and
reduce statistics target overhead

Also consider having a larger statistics target for indexed columns
and expression indexes

Modified Files:
--------------
pgsql/doc:
TODO (r1.2296 -> r1.2297)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2296&r2=1.2297)
pgsql/doc/src/FAQ:
TODO.html (r1.805 -> r1.806)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.805&r2=1.806)