*: 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/procps/fuser.c b/procps/fuser.c
index 85523c3..addf1a7 100644
--- a/procps/fuser.c
+++ b/procps/fuser.c
@@ -4,7 +4,7 @@
  *
  * Copyright 2004 Tony J. White
  *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"