Following the license change, modify the boilerplates in doc/man3/

[skip ci]

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7829)
diff --git a/doc/man3/SSL_get_extms_support.pod b/doc/man3/SSL_get_extms_support.pod
index 9719c0a..60ea8e1 100644
--- a/doc/man3/SSL_get_extms_support.pod
+++ b/doc/man3/SSL_get_extms_support.pod
@@ -32,7 +32,7 @@
 
 Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
 
-Licensed under the OpenSSL license (the "License").  You may not use
+Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy
 in the file LICENSE in the source distribution or at
 L<https://www.openssl.org/source/license.html>.