[gnome-devel-docs] Update FSF address

[Andre Klapper <aklapper src gnome org>]

commit c27ce5c9285ca4d0c4383f1f3dfaa643f0adc905
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon May 25 13:17:35 2020 +0200

    Update FSF address
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770008

 COPYING.GFDL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/COPYING.GFDL b/COPYING.GFDL
index b42936be..06d59593 100644
--- a/COPYING.GFDL
+++ b/COPYING.GFDL
@@ -2,7 +2,7 @@
                   Version 1.1, March 2000
 
  Copyright (C) 2000  Free Software Foundation, Inc.
-     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.