remove reference to cdist_type, use GPL3+

as requested by darko-poljak here:
https://github.com/ungleich/cdist/pull/360#issuecomment-264110087

cdist/conf/type/__postgres_extension/man.rst

@@ -43,7 +43,7 @@ EXAMPLES
 
 SEE ALSO
 --------
-:strong:`cdist-type`\ (7), :strong:`cdist-type__postgre_database`\ (7)
+:strong:`cdist-type__postgre_database`\ (7)
 
 Postgres "Create Extension" documentation at: <http://www.postgresql.org/docs/current/static/sql-createextension.html>.
 
@@ -53,5 +53,7 @@ Tomas Pospisek <tpo_deb--@--sourcepole.ch>
 
 COPYING
 -------
-Copyright \(C) 2014 Tomas Pospisek. Free use of this software is
-granted under the terms of the GNU General Public License version 3 (GPLv3).
+Copyright \(C) 2014 Tomas Pospisek. You can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.