docs: update toast.md (#634)

Module '"vue"' has no exported member 'InstanceType'.

docs/content/components/toast.md

@@ -659,7 +659,6 @@ Create your own imperative API to allow [toast duplication](/components/toast#du
 ```vue
 <script setup lang="ts">
 import Toast from './your-toast.vue'
-import type { InstanceType } from 'vue'
 
 const savedRef = ref<InstanceType<typeof Toast>>()
 </script>
@@ -706,4 +705,4 @@ defineExpose({
   </ToastRoot>
 </template>
 ```
-
+