fix(components): improve generic types (#3331)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/content/3.components/dropdown-menu.md

@@ -44,6 +44,8 @@ ignore:
   - ui.content
 external:
   - items
+externalTypes:
+  - DropdownMenuItem[][]
 props:
   items:
     - - label: Benjamin
@@ -123,6 +125,8 @@ ignore:
   - ui.content
 external:
   - items
+externalTypes:
+  - DropdownMenuItem[]
 items:
   content.align:
     - start
@@ -169,6 +173,8 @@ ignore:
   - ui.content
 external:
   - items
+externalTypes:
+  - DropdownMenuItem[]
 props:
   arrow: true
   items:
@@ -202,6 +208,8 @@ ignore:
   - ui.content
 external:
   - items
+externalTypes:
+  - DropdownMenuItem[]
 props:
   size: xl
   items:
@@ -244,6 +252,8 @@ ignore:
   - ui.content
 external:
   - items
+externalTypes:
+  - DropdownMenuItem[]
 props:
   disabled: true
   items:
@@ -334,7 +344,9 @@ Inside the `defineShortcuts` composable, there is an `extractShortcuts` utility
 
 ```vue
 <script setup lang="ts">
-const items = [{
+import type { DropdownMenuItem } from '@nuxt/ui'
+
+const items: DropdownMenuItem[] = [{
   label: 'Invite users',
   icon: 'i-lucide-user-plus',
   children: [{