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>

1 files changed, 1 insertions, 0 deletions

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index cbe864e72a2f..b3b992617951 100755
--- 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;