*: 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/telnet.c b/networking/telnet.c
index e0022b2..12d1970 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -8,7 +8,7 @@
  * Created: Thu Apr  7 13:29:41 1994 too
  * Last modified: Fri Jun  9 14:34:24 2000 too
  *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  *
  * HISTORY
  * Revision 3.1  1994/04/17  11:31:54  too