Revert duplicate changes in argparse docs.

Doc/library/argparse.rst

@@ -1425,21 +1425,6 @@ be achieved by specifying the ``namespace=`` keyword argument::
    'BAR'
 
 
-Converting the namespace to a dict
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-It's possible to convert a namespace to a :class:`dict` by using the built-in
-function :func:`vars` in this fashion::
-
-    args = parser.parse_args()
-    argdict = vars(args)
-
-This makes it easy to introspect the namespace or to pass the command-line
-arguments to a function taking a bunch of keyword arguments::
-
-    somefunction(**vars(parser.parse_args()))
-
-
 Other utilities
 ---------------