org-element.el: Added "This file is not part of GNU Emacs".

contrib/lisp/org-element.el

@@ -15,6 +15,8 @@
 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ;; GNU General Public License for more details.
 
+;; This file is not part of GNU Emacs.
+
 ;; You should have received a copy of the GNU General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.