docs: def insert_tab_in_order(self, pos, align, leader):
          """
          Insert a newly created `w:tab` child element in *pos* order.
          """
          new_tab = self._new_tab()
          new_tab.pos, new_tab.val, new_tab.leader = pos, align, leader
          for tab in self.tab_lst:
              if new_tab.pos < tab.pos:
                  tab.addprevious(new_tab)
                  return new_tab
          self.append(new_tab)
          return new_tab