Log Message:
-----------
Add a note pointing out that some other databases make GREATEST and
LEAST handle NULL arguments differently than we do. Per a discussion
on 30-Jun that somehow didn't get done.
Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.405 -> r1.406)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.405&r2=1.406)