*: 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/chmod.c b/coreutils/chmod.c
index c04201e..f07a49b 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -7,7 +7,7 @@
  * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
  *  to correctly parse '-rwxgoa'
  *
- * 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.
  */
 
 /* BB_AUDIT SUSv3 compliant */