docs: update template refs render function (#3126)

* docs: update template refs render function

* chore: remove sample

* Update src/guide/extras/render-function.md

resolved conversation

Co-authored-by: Natalia Tepluhina <[email protected]>

---------

Co-authored-by: Natalia Tepluhina <[email protected]>

Author: lequangdongg

src/guide/extras/render-function.md

@@ -721,6 +721,21 @@ export default {
 }
 ```
 
+or (with version >= 3.5)
+
+```js
+import { h, useTemplateRef } from 'vue'
+
+export default {
+  setup() {
+    const divEl = useTemplateRef('my-div')
+
+    // <div ref="divEl">
+    return () => h('div', { ref: 'my-div' })
+  }
+}
+```
+
 </div>
 <div class="options-api">