Tidy up Flipper license headers [2/2]

Reviewed By: passy

Differential Revision: D17863710

fbshipit-source-id: 5b249bdd1c06d3a526b250b035b797d0c8e796eb

website/static/js/code-blocks-buttons.js

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2017-present, Facebook, Inc.
+ * Copyright (c) Facebook, Inc. and its affiliates.
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.