message: docs: fixed an example after new meta API
diff: @@ -316,8 +316,8 @@ As you noticed the `<Form />` component gives you access to the `errors` on its
  and if you would like, you could display all error messages for your fields by iterating over the `errors` object:
  ```vue
  -<Form v-slot="{ errors, meta }">
  - <template v-if="!meta.valid && meta.dirty">
  +<Form v-slot="{ errors }">
  + <template v-if="Object.keys(errors).length">
  <p>Please correct the following errors</p>
  <ul>
  <li v-for="(message, field) in errors" :key="field">
  