docs(form): use useTemplateRef

docs/content/3.components/form.md

@@ -167,7 +167,19 @@ name: 'form-example-nested-list'
 
 ### Expose
 
-When accessing the component via a template ref, you can use the following:
+You can access the typed component instance using [`useTemplateRef`](https://vuejs.org/api/composition-api-helpers.html#usetemplateref).
+
+```vue
+<script setup lang="ts">
+const form = useTemplateRef('form')
+</script>
+
+<template>
+  <UForm ref="form" />
+</template>
+```
+
+This will give you access to the following:
 
 | Name | Type |
 | ---- | ---- |