Changing license header, again!

appengine/swarming/static/default.css

 /* Copyright 2013 The LUCI Authors. All rights reserved.
- * Use of this source code is governed by the Apache v2.0 license that can be
- * found in the LICENSE file.
+ * Use of this source code is governed under the Apache License, Version 2.0
+ * that can be found in the LICENSE file.
  */
 table.alterning_background {
   border: 1;
   border-color: black;
   border-collapse: collapse;
 }
 
 table.alterning_background thead {
   color: #fff;
   background-color: #000;
@@ skipping 33 matching lines @@
 }
 
 .graph {
   height: 600px;
   width: 100%;
 }
 
 ul li {
   padding-top: 5px;
 }