update upload doc and design page template (#3255)

examples/docs/zh-CN/upload.md

@@ -376,6 +376,9 @@
       };
     },
     methods: {
+      submitUpload() {
+        this.$refs.upload.submit();
+      },
       handleRemove(file, fileList) {
         console.log(file, fileList);
       },

examples/pages/template/design.tpl

@@ -54,7 +54,7 @@
           <img src="~examples/assets/images/controllability.png" alt="Controllability">
           <h4><%= 8 ></h4>
           <span><%= 9 ></span>
-        </ul>
+        </div>
       </el-col>
     </el-row>
     <h3><%= 10 ></h3>