vop_link: reorder commented arguments to match actual calling order

(dvp, vp).

ok wrstuden@

sys/kern/vnode_if.src

@@ -1,4 +1,4 @@
-#	$NetBSD: vnode_if.src,v 1.51 2007/01/07 21:33:24 pooka Exp $
+#	$NetBSD: vnode_if.src,v 1.52 2007/04/09 14:58:28 gdt Exp $
 #
 # Copyright (c) 1992, 1993
 #	The Regents of the University of California.  All rights reserved.
@@ -277,8 +277,8 @@ vop_remove {
 };
 
 #
-#% link               vp      U U U
 #% link               dvp     L U U
+#% link               vp      U U U
 #
 #! link	 cnp	CREATE, LOCKPARENT
 #