Docs: changed Authors section to Copyright section in unitd.8.

The Authors section is meant to list the main authors.  However, the
section only contained the copyright notice, so the Copyright section
seems more appropriate.  While we change that, it makes sense to also
specify the license, and update the copyright year.

Reviewed-by: Liam Crilly <[email protected]>
Reviewed-by: Artem Konev <[email protected]>
Signed-off-by: Alejandro Colomar <[email protected]>

Author: alejandro-colomar

docs/man/man8/unitd.8.in

@@ -66,8 +66,10 @@ A general-purpose log for diagnostics and troubleshooting.
 .It Pa %%SOCKET_PATH%%
 The socket address of Unit's control API.
 .El
-.Sh Authors
-(C) 2017-2021, NGINX, Inc.
+.Sh Copyright
+(C) 2017-2023, NGINX, Inc.
+.Pp
+SPDX-License-Identifier: Apache-2.0
 .Sh See also
 .Pp
 Website: