docs(ComponentExample): automatically read code (#789)

docs/content/3.forms/6.radio.md

@@ -10,35 +10,7 @@ links:
 
 Use a `v-model` to make the Radio reactive.
 
-::component-example
-#default
-:radio-example
-
-#code
-```vue
-<script setup>
-const methods = [{
-  name: 'email',
-  value: 'email',
-  label: 'Email'
-}, {
-  name: 'sms',
-  value: 'sms',
-  label: 'Phone (SMS)'
-}, {
-  name: 'push',
-  value: 'push',
-  label: 'Push notification'
-}]
-
-const selected = ref('sms')
-</script>
-
-<template>
-  <URadio v-for="method of methods" :key="method.name" v-model="selected" v-bind="method" />
-</template>
-```
-::
+:component-example{component="radio-example"}
 
 ### Label