docs: fix 主题定制样式引用文件修改

src/docs/starttaro.md

@@ -89,7 +89,7 @@ import { createApp } from "vue";
 import App from "./App.vue";
 import { Button, Cell, Icon } from "@nutui/nutui-taro";
 // 定制化主题必须使用 scss 
-import "@nutui/nutui-taro/dist/style.scss";
+import '@nutui/nutui-taro/dist/styles/themes/default.scss';
 createApp(App).use(Button).use(Cell).use(Icon);
 ```