Fix comment: We don't use RC4 anymore, it's better to be more

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.444 2014/11/17 18:19:08 deraadt Exp $
+#	$OpenBSD: rc,v 1.445 2014/11/30 18:06:45 dcoppa Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -359,7 +359,7 @@ if [ -f /etc/resolv.conf.save ]; then
 	touch /etc/resolv.conf
 fi
 sh /etc/netstart
-dmesg > /dev/random	# any write triggers an RC4 rekey
+dmesg > /dev/random	# any write triggers a rekey
 
 if [ X"${pf}" != X"NO" ]; then
 	if [ -f ${pf_rules} ]; then