docs(use-click-outside): document array of targets via MaybeArray

Author: johnleider

apps/docs/src/pages/composables/system/use-click-outside.md

@@ -55,6 +55,25 @@ flowchart TD
   useClickOutside --> Popovers
 ```
 
+## Multiple Targets
+
+Pass an array of refs to ignore clicks inside any of them:
+
+```ts
+import { useClickOutside } from '@vuetify/v0'
+import { useTemplateRef } from 'vue'
+
+const trigger = useTemplateRef('trigger')
+const panel = useTemplateRef('panel')
+
+// Clicks inside EITHER trigger or panel are ignored
+useClickOutside([trigger, panel], () => {
+  console.log('Clicked outside both elements')
+})
+```
+
+The `target` parameter accepts `MaybeArray<ClickOutsideTarget>` — a single ref/getter or an array of refs/getters.
+
 ## Options
 
 | Option | Type | Default | Description |