docs(toast): update

docs/app/components/content/examples/toast/ToastIconExample.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+const props = defineProps<{
+  icon: string
+}>()
+
+const toast = useToast()
+
+function showToast() {
+  toast.add({
+    title: 'Uh oh! Something went wrong.',
+    description: 'There was a problem with your request.',
+    icon: props.icon
+  })
+}
+</script>
+
+<template>
+  <UButton label="Show toast" color="gray" variant="outline" @click="showToast" />
+</template>