pgsql: Add another URL for: * Consider increasing the number of default

Log Message:
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Add another URL for:

* 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
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http://archives.postgresql.org/pgsql-general/2007-06/msg00542.php

Modified Files:
--------------
pgsql/doc:
TODO (r1.2298 -> r1.2299)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2298&amp;r2=1.2299)
pgsql/doc/src/FAQ:
TODO.html (r1.807 -> r1.808)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.807&amp;r2=1.808)