*: 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/taskset.c b/miscutils/taskset.c
index 08198d5..389ef43 100644
--- a/miscutils/taskset.c
+++ b/miscutils/taskset.c
@@ -3,7 +3,7 @@
  * taskset - retrieve or set a processes' CPU affinity
  * Copyright (c) 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 <sched.h>