[1.4.x] Fixed #20326 - Corrected form wizard get_form() example.

.. method:: WizardView.get_form(step=None, data=None, files=None)

    This method constructs the form for a given ``step``. If no ``step`` is

    defined, the current step will be determined automatically.

    The method gets three arguments:

    defined, the current step will be determined automatically. If you override

    ``get_form``, however, you will need to set ``step`` yourself using

    ``self.steps.current`` as in the example below. The method gets three

    arguments:

    * ``step`` -- The step for which the form instance should be generated.

    * ``data`` -- Gets passed to the form's data argument

        def get_form(self, step=None, data=None, files=None):

            form = super(MyWizard, self).get_form(step, data, files)

            # determine the step if not given

            if step is None:

                step = self.steps.current

            if step == '1':

                form.user = self.request.user

            return form