ftpd(8) allows users to connect when listed in /etc/ftpchroot too;

this change has been suggested by form@ as a part of a larger issue
we are looking at right now.
grammatical review by jmc@
ok millert@

src/etc/shells

@@ -1,8 +1,8 @@
-#	$OpenBSD: shells,v 1.7 2009/01/22 16:39:45 sobrado Exp $
+#	$OpenBSD: shells,v 1.8 2009/02/14 17:06:40 sobrado Exp $
 #
 # list of acceptable shells for chpass(1).
 # ftpd(8) will not allow users to connect who are not using
-# one of these shells.
+# one of these shells, unless the user is listed in /etc/ftpchroot.
 /bin/sh
 /bin/csh
 /bin/ksh