docs: fix vue example

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

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import {
+  ContextMenuSub,
+  type ContextMenuSubEmits,
+  type ContextMenuSubProps,
+  useForwardPropsEmits,
+} from 'radix-vue'
+
+const props = defineProps<ContextMenuSubProps>()
+const emits = defineEmits<ContextMenuSubEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <ContextMenuSub v-bind="forwarded">
+    <slot />
+  </ContextMenuSub>
+</template>