Tidy up license headers

Summary: Changelog: Tidy up license headers

Reviewed By: SidharthGuglani

Differential Revision: D17919414

fbshipit-source-id: 0501b495dc0a42256ca6ba3284a873da1ab175c0

csharp/tests/Facebook.Yoga/test_macos.sh

@@ -1,4 +1,9 @@
 #!/bin/sh
+# 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.
+
 if mcs --version >/dev/null 2>&1 && mono --version >/dev/null 2>&1; then true; else
   echo "ERROR: Need to install Mono (brew install mono, or http://www.mono-project.com/download/)"
   exit 1