[education/blinken] doc: Add license markers to docbook

[Albert Astals Cid]

Git commit 62f9d4622ae87dd15eae8eddcec19847ada6fbd1 by Albert Astals Cid, on behalf of Andreas Cord-Landwehr.
Committed on 02/01/2021 at 19:16.
Pushed by aacid into branch 'master'.

Add license markers to docbook

M  +4    -0    doc/index.docbook

https://invent.kde.org/education/blinken/commit/62f9d4622ae87dd15eae8eddcec19847ada6fbd1

diff --git a/doc/index.docbook b/doc/index.docbook
index dbcd92b..05710e2 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -4,6 +4,10 @@
  <!ENTITY % addindex "IGNORE">
  <!ENTITY % English "INCLUDE"><!-- change language only here -->
 ]>
+<!--
+SPDX-FileCopyrightText: 2005 Danny Allen <danny at dannyallen.co.uk>
+SPDX-License-Identifier: GFDL-1.2-only
+-->
 
 <book id="blinken" lang="&language;">