Strike out content in a rectangle or quadrilateral.

def addStrikeoutAnnot(self, rect):
        """Strike out content in a rectangle or quadrilateral."""
        CheckParent(self)

        val = _fitz.Page_addStrikeoutAnnot(self, rect)

        if not val: return
        val.thisown = True
        val.parent = weakref.proxy(self)
        self._annot_refs[id(val)] = val

        return val