Update Doxygen file blocks to remove copyright and license information
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index f9f9b9b..28f6150 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -2,7 +2,8 @@
  * \file pk.h
  *
  * \brief Public Key abstraction layer
- *
+ */
+/*
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *