docs: Add an SPDX header to kernel-doc

Add the SPDX header while I'm in the neighborhood.  The source itself just
says "GNU General Public License", but it also refers people to the COPYING
file for further information.  Since COPYING says 2.0-only, that is what I
have put into the header.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index cbe864e72a2fc967e3baa672ad965928cd82bc4b..b3b9926179510229e131491cd2632e5f55a00497 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1,4 +1,5 @@
 #!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
 
 use warnings;
 use strict;