docs(content): improve examples

docs/app/components/content/examples/navigation-menu/NavigationMenuCustomSlotExample.vue

@@ -1,23 +1,21 @@
 <script setup lang="ts">
 import type { NavigationMenuItem } from '@nuxt/ui'
 
-const items: NavigationMenuItem[] = [
+const items = [
   {
     label: 'Guide',
     icon: 'i-lucide-book-open'
-
   },
   {
     label: 'Composables',
     icon: 'i-lucide-database'
-
   },
   {
     label: 'Components',
     icon: 'i-lucide-box',
-    slot: 'components'
+    slot: 'components' as const
   }
-]
+] satisfies NavigationMenuItem[]
 </script>
 
 <template>