*: 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/coreutils/nohup.c b/coreutils/nohup.c
index 3dc5314..c21aae9 100644
--- a/coreutils/nohup.c
+++ b/coreutils/nohup.c
@@ -7,7 +7,7 @@
  * Copyright 2006 Rob Landley <rob@landley.net>
  * Copyright 2006 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 "libbb.h"