pythonPackages.monty: Add a short description

pkgs/development/python-modules/monty/default.nix

···
   '';
 
   meta = with stdenv.lib; {
+    description = "Serves as a complement to the Python standard library by providing a suite of tools to solve many common problems";
     longDescription = "
       Monty implements supplementary useful functions for Python that are not part of the 
       standard library. Examples include useful utilities like transparent support for zipped files, useful design