docs: fix vue example

examples/nuxt-example/components/ui/select/SelectGroup.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import { type HTMLAttributes, computed } from 'vue'
+import { SelectGroup, type SelectGroupProps } from 'radix-vue'
+import { cn } from '@/lib/utils'
+
+const props = defineProps<SelectGroupProps & { class?: HTMLAttributes['class'] }>()
+
+const delegatedProps = computed(() => {
+  const { class: _, ...delegated } = props
+
+  return delegated
+})
+</script>
+
+<template>
+  <SelectGroup :class="cn('p-1 w-full', props.class)" v-bind="delegatedProps">
+    <slot />
+  </SelectGroup>
+</template>