def __write_docstring_return_type(self):
        """
        Writes the return type part of the docstring for the wrapper method of a stored routine.
        """
        rtype = self._get_docstring_return_type()
        if rtype:
            self._write_line('')
            self._write_line(':rtype: {0}'.format(rtype))
Writes the return type part of the docstring for the wrapper method of a stored routine.