[beast: 1/9] DOCS: main.dox: relicense as LGPL v2.1+

[Tim Janik <timj src gnome org>]

commit c1963f59bf96255d5e081897495a3ed2546d8ab7
Author: Tim Janik <timj gnu org>
Date:   Sat Jul 15 02:21:32 2017 +0200

    DOCS: main.dox: relicense as LGPL v2.1+
    
    Signed-off-by: Tim Janik <timj gnu org>

 docs/main.dox |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/main.dox b/docs/main.dox
index ee07d47..cf61502 100644
--- a/docs/main.dox
+++ b/docs/main.dox
@@ -1,4 +1,4 @@
-// Licensed GNU LGPL v3 or later, see: www.gnu.org
+// Licensed GNU LGPL v2.1 or later: http://www.gnu.org/licenses/lgpl.html
 /*! @mainpage
 
 @section documents Documents