Update Doxygen file blocks to remove copyright and license information
diff --git a/include/mbedtls/x509_csr.h b/include/mbedtls/x509_csr.h
index fe9843c..0c6ccad 100644
--- a/include/mbedtls/x509_csr.h
+++ b/include/mbedtls/x509_csr.h
@@ -2,7 +2,8 @@
  * \file x509_csr.h
  *
  * \brief X.509 certificate signing request parsing and writing
- *
+ */
+/*
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *