*: 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/cp.c b/coreutils/cp.c
index d7c8d91..ab17b39 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -5,7 +5,7 @@
  * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
  * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
  *
- * Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */