docs(accordion): update

docs/app/components/content/examples/tabs/TabsModelValueExample.vue

@@ -8,12 +8,12 @@ const items = [
   }
 ]
 
-const active = ref('1')
+const active = ref('0')
 
 // Note: This is for demonstration purposes only.
 onMounted(() => {
   setInterval(() => {
-    active.value = active.value === '0' ? '1' : '0'
+    active.value = String((Number(active.value) + 1) % items.length)
   }, 2000)
 })
 </script>