docs:fix chapter16

docs/chapter16/第十六章 毕业设计.md

@@ -625,7 +625,7 @@ git push origin feature/你的项目名称
 3. 点击"New pull request"按钮
 
 <div align="center">
-  <img src="https://raw.githubusercontent.com/datawhalechina/Hello-Agents/main/docs/images/16-figures/16-4-create-pr.png" alt="" width="85%"/>
+  <img src="https://raw.githubusercontent.com/datawhalechina/Hello-Agents/main/docs/images/16-figures/16-3.png" alt="" width="85%"/>
   <p>图 16.3 创建Pull Request</p>
 </div>
 
@@ -699,7 +699,7 @@ git push origin feature/你的项目名称
 如图16.4所示，点击"Create pull request"按钮提交。
 
 <div align="center">
-  <img src="https://raw.githubusercontent.com/datawhalechina/Hello-Agents/main/docs/images/16-figures/16-6-submit-pr.png" alt="" width="85%"/>
+  <img src="https://raw.githubusercontent.com/datawhalechina/Hello-Agents/main/docs/images/16-figures/16-4.png" alt="" width="85%"/>
   <p>图 16.4 提交Pull Request</p>
 </div>