refactor: ♻️ 组件 name 调整大写

Former-commit-id: e8d8f7b28d8866fc670fbf777efeb5f4256d810f

src/views/demo/multi-level/level1.vue

@@ -1,5 +1,13 @@
 <template>
   <div style="padding: 30px">
+    <el-link
+      href="https://gitee.com/youlaiorg/vue3-element-admin/blob/master/src/views/demo/upload.vue"
+      type="primary"
+      target="_blank"
+      class="mb-10"
+      >示例源码 请点击>>>></el-link
+    >
+
     <el-alert :closable="false" title="菜单一级">
       <router-view />
     </el-alert>