docs(tabbar): 添加carbon图标导入注释

src/tabbar/index.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+// i-carbon-code
 import type { CustomTabBarItem } from './config'
 import { customTabbarEnable, needHideNativeTabbar, tabbarCacheEnable } from './config'
 import { tabbarList, tabbarStore } from './store'