docs: def augment_cells_no_span(self, rows, source):
          """Convert each cell into a tuple suitable for consumption by build_table.
          """
          # TODO: Hardwired str transform.
          # 4-tuple: morerows, morecols, offset, cellblock
          # - morerows: The number of additional rows this cells spans
          # - morecols: The number of additional columns this cell spans
          # - offset: Offset from the line-number at the start of the table
          # - cellblock: The contents of the cell
          return [
              [(0, 0, 0, StringList(str(cell).splitlines(), source=source)) for cell in row]
              for row in rows
          ]