docs(dropdown-menu): update

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

@@ -0,0 +1,23 @@
+<script setup lang="ts">
+const items = [{
+  label: 'Profile',
+  icon: 'i-heroicons-user',
+  slot: 'profile'
+}, {
+  label: 'Billing',
+  icon: 'i-heroicons-credit-card'
+}, {
+  label: 'Settings',
+  icon: 'i-heroicons-cog'
+}]
+</script>
+
+<template>
+  <UDropdownMenu :items="items" class="w-48">
+    <UButton label="Open" color="gray" variant="outline" icon="i-heroicons-bars-3" />
+
+    <template #profile-trailing>
+      <UIcon name="i-heroicons-check-badge" class="shrink-0 size-5 text-primary-500 dark:text-primary-400" />
+    </template>
+  </UDropdownMenu>
+</template>