Gets the completion description for a TypeExecutable.

def _type_description(self):
        """Gets the completion description for a TypeExecutable."""
        #This is a little tricker because the docstring is housed
        #inside of the module that contains the actual executable.
        #These TypeExecutables are just pointers.
        iexec = self._element.target
        if iexec is not None:
            result = "method() | " + iexec.summary
        else:
            result = "Type Method: points to executable in module."    
        return result