Log Message:
-----------
Document tri-valued variables in createdb, +1, -1, 0.
Modified Files:
--------------
pgsql/src/bin/scripts:
createuser.c (r1.21 -> r1.22)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createuser.c.diff?r1=1.21&r2=1.22)