fix(notebook): update to final version

notebook中，Week 4, April-Week 2, May 2025小标题下，“Selected tomato and Pseudomonas syringaetomato pv. tomato (Pst) as the central elements of the project.”这句替换成“Selected tomato and Pseudomonas syringae pv. tomato (Pst) as the central elements of the project.”（删去了syringae后多余的tomato）