docs: fix vue example

examples/nuxt-example/components/ui/form/FormMessage.vue

@@ -0,0 +1,16 @@
+<script lang="ts" setup>
+import { ErrorMessage } from 'vee-validate'
+import { toValue } from 'vue'
+import { useFormField } from './useFormField'
+
+const { name, formMessageId } = useFormField()
+</script>
+
+<template>
+  <ErrorMessage
+    :id="formMessageId"
+    as="p"
+    :name="toValue(name)"
+    class="text-[0.8rem] font-medium text-destructive"
+  />
+</template>