one more

documentation/conf.py

 #
 # (c) Copyright 2020 CORSIKA Project, corsika-project@lists.kit.edu
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 """