/* scroll the viewing area of the sheet to the given column
* and row; row_align and col_align are between 0-1 representing the
- * location the row should appear on the screnn, 0.0 being top or left,
+ * location the row should appear on the screen, 0.0 being top or left,
* 1.0 being bottom or right; if row or column is negative then there
* is no change */
void