docs: fix vue example

examples/nuxt-example/components/ui/context-menu/ContextMenuGroup.vue

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+import { ContextMenuGroup, type ContextMenuGroupProps } from 'radix-vue'
+
+const props = defineProps<ContextMenuGroupProps>()
+</script>
+
+<template>
+  <ContextMenuGroup v-bind="props">
+    <slot />
+  </ContextMenuGroup>
+</template>