Return a newly created `a:lnTo` subtree with end point *(x, y)*.

        The new `a:lnTo` element is appended to this `a:path` element.

def add_lnTo(self, x, y):
        """Return a newly created `a:lnTo` subtree with end point *(x, y)*.

        The new `a:lnTo` element is appended to this `a:path` element.
        """
        lnTo = self._add_lnTo()
        pt = lnTo._add_pt()
        pt.x, pt.y = x, y
        return lnTo