*: 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/miscutils/chrt.c b/miscutils/chrt.c
index d5f87c4..c40277b 100644
--- a/miscutils/chrt.c
+++ b/miscutils/chrt.c
@@ -3,7 +3,7 @@
  * chrt - manipulate real-time attributes of a process
  * Copyright (c) 2006-2007 Bernhard Reutner-Fischer
  *
- * 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 <sched.h>
 #include "libbb.h"