*: make GNU licensing statement forms more regular

This change retains "or later" state! No licensing _changes_ here,
only form is adjusted (article, space between "GPL" and "v2" and so on).

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/nc.c b/networking/nc.c
index c771374..31d450d 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -1,10 +1,10 @@
 /* vi: set sw=4 ts=4: */
-/*  nc: mini-netcat - built from the ground up for LRP
+/* nc: mini-netcat - built from the ground up for LRP
  *
- *  Copyright (C) 1998, 1999  Charles P. Wright
- *  Copyright (C) 1998  Dave Cinege
+ * Copyright (C) 1998, 1999  Charles P. Wright
+ * Copyright (C) 1998  Dave Cinege
  *
- *  Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"