Adapt nsd(1) comment to match the default daemon_flags of the rc.d script.

ok sthen@

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.183 2013/12/15 17:40:45 tedu Exp $
+#	$OpenBSD: rc.conf,v 1.184 2013/12/18 09:12:33 ajacoutot Exp $
 
 # DO NOT EDIT THIS FILE!!
 #
@@ -26,7 +26,7 @@ bootparamd_flags=NO	# for normal use: ""
 rbootd_flags=NO		# for normal use: ""
 sshd_flags=""		# for normal use: ""
 named_flags=NO		# for normal use: ""
-nsd_flags=NO		# for normal use: ""
+nsd_flags=NO		# for normal use: "-c /var/nsd/etc/nsd.conf"
 ldattach_flags=NO	# for normal use: "[options] linedisc cua-device"
 ntpd_flags=NO		# for normal use: ""
 isakmpd_flags=NO	# for normal use: ""