docs: def spacing_lineRule(self):
          """
          The value of `w:spacing/@w:lineRule` as a member of the
          :ref:`WdLineSpacing` enumeration. Only the `MULTIPLE`, `EXACTLY`, and
          `AT_LEAST` members are used. It is the responsibility of the client
          to calculate the use of `SINGLE`, `DOUBLE`, and `MULTIPLE` based on
          the value of `w:spacing/@w:line` if that behavior is desired.
          """
          spacing = self.spacing
          if spacing is None:
              return None
          lineRule = spacing.lineRule
          if lineRule is None and spacing.line is not None:
              return WD_LINE_SPACING.MULTIPLE
          return lineRule