Adapt preamble for newly created ssl_msg.c

library/ssl_msg.c

diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index bed3e52..6cee53a 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -1,7 +1,8 @@
 /*
- *  SSLv3/TLSv1 shared functions
+ *  Generic SSL/TLS messaging layer functions
+ *  (record layer + retransmission state machine)
  *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  Copyright (C) 2006-2020, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may