doc: fix man page copyright notice

* doc/tar.1: Put copyright notice where the update procedure
will update it properly, and fix it.

doc/tar.1

@@ -1,5 +1,4 @@
 .\" This file is part of GNU tar. -*- nroff -*-
-.\" Copyright 2013\(en2025 Free Software Foundation, Inc.
 .\"
 .\" GNU tar is free software; you can redistribute it and/or modify
 .\" it under the terms of the GNU General Public License as published by
@@ -13,7 +12,7 @@
 .\"
 .\" You should have received a copy of the GNU General Public License
 .\" along with this program.  If not, see <http://www.gnu.org/licenses/>.
-.TH TAR 1 "June 7, 2024" "TAR" "GNU TAR Manual"
+.TH TAR 1 "January 1, 2025" "TAR" "GNU TAR Manual"
 .SH NAME
 tar \- an archiving utility
 .SH SYNOPSIS
@@ -1320,7 +1319,7 @@ found at:
 .SH "BUG REPORTS"
 Report bugs to <bug\-tar@gnu.org>.
 .SH COPYRIGHT
-Copyright \(co 2023, 2025 Free Software Foundation, Inc.
+Copyright \(co 2013\(en2025 Free Software Foundation, Inc.
 .br
 .na
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>