pgsql: Update wording: < STABLE | DEFAULT ].

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

< STABLE | DEFAULT ]. [wallog]

STABLE | DEFAULT ]. Tables using non-default logging should not use
referential integrity with default-logging tables, and tables using
stable logging probably can not have indexes. [wallog]

Modified Files:
--------------
pgsql/doc:
TODO (r1.1744 -> r1.1745)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1744&amp;r2=1.1745)
pgsql/doc/src/FAQ:
TODO.html (r1.249 -> r1.250)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.249&amp;r2=1.250)