19.680 table:number-rows-spanned - second paragraph

Move "When a cell covers another cell because of a column or row span value greater than one, a <table:covered-table-cell> element shall appear in the table to represent the covered cell." to 9.1.5. Moved but also cleaned up the paragraph at 9.1.5. Sure, but also need to simply re-write 9.1.5 as follows: The <table:covered-table-cell> element represents cells that are covered by a <table:table-cell> 9.1.4 element that spans multiple columns or rows. The <table:covered-table-cell> elements occupy the same position in document order as the cells spanned. There is one <table:covered-table-cell> element for each cell that is spanned.