message: docs: update cdn guide
diff: @@ -102,19 +102,20 @@ The easiest way to use Vant is to include a CDN link in the html file, after whi
  <!-- import style -->
  <link
  rel="stylesheet"
  - href="https://cdn.jsdelivr.net/npm/vant@2.9/lib/index.css"
  + href="https://cdn.jsdelivr.net/npm/vant@next/lib/index.css"
  />
  <!-- import script -->
  -<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>
  -<script src="https://cdn.jsdelivr.net/npm/vant@2.9/lib/vant.min.js"></script>
  +<script src="https://cdn.jsdelivr.net/npm/vue@next"></script>
  +<script src="https://cdn.jsdelivr.net/npm/vant@next/lib/vant.min.js"></script>
  <script>
  // Render the Button component
  - new Vue({
  - el: '#app',
  + const app = Vue.createApp({
  template: `<van-button>Button</van-button>`,
  });
  + app.use(vant);
  + app.mount('#app');
  // Call function component
  vant.Toast('Message');
  