code: def _remove_hlink(self):
          
          hlink = self._hlink
          if hlink is None:
              return
          rId = hlink.rId
          if rId:
              self.part.drop_rel(rId)
          self._element.remove(hlink)
docs: Remove the a:hlinkClick or a:hlinkHover element, including dropping
          any relationship it might have.