docs(dropdown-menu): update

docs/app/components/content/examples/dropdown-menu/DropdownMenuOpenExample.vue

@@ -0,0 +1,24 @@
+<script setup lang="ts">
+const open = ref(true)
+
+defineShortcuts({
+  o: () => open.value = !open.value
+})
+
+const items = [{
+  label: 'Profile',
+  icon: 'i-heroicons-user'
+}, {
+  label: 'Billing',
+  icon: 'i-heroicons-credit-card'
+}, {
+  label: 'Settings',
+  icon: 'i-heroicons-cog'
+}]
+</script>
+
+<template>
+  <UDropdownMenu v-model:open="open" :items="items" class="w-48">
+    <UButton label="Open" color="gray" variant="outline" icon="i-heroicons-bars-3" />
+  </UDropdownMenu>
+</template>