Fix copyright lines for folly/Synchronized.h

Summary: [Folly] Fix copyright lines for `folly/Synchronized.h`.

Reviewed By: meyering

Differential Revision: D6664326

fbshipit-source-id: 71a0fc17358e41dfc751b8bcb0736c288975a4a0

folly/Synchronized.h

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2011-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/SynchronizedPtr.h

 /*
- * Copyright 2004-present Facebook, Inc.
+ * Copyright 2017-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/SynchronizedPtrTest.cpp

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2017-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/SynchronizedTest.cpp

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2011-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/SynchronizedTestLib-inl.h

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2012-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/SynchronizedTestLib.h

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2012-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.