docs: def line_spacing(self):
          """
          |float| or |Length| value specifying the space between baselines in
          successive lines of the paragraph. A value of |None| indicates line
          spacing is inherited from the style hierarchy. A float value, e.g.
          ``2.0`` or ``1.75``, indicates spacing is applied in multiples of
          line heights. A |Length| value such as ``Pt(12)`` indicates spacing
          is a fixed height. The |Pt| value class is a convenient way to apply
          line spacing in units of points. Assigning |None| resets line spacing
          to inherit from the style hierarchy.
          """
          pPr = self._element.pPr
          if pPr is None:
              return None
          return self._line_spacing(pPr.spacing_line, pPr.spacing_lineRule)