message: docs: added observer validate thenable note
diff: @@ -79,7 +79,7 @@ If you plan to trigger validation from the template without using `refs` you can
  ```vue
  <template>
  <ValidationObserver>
  - <form slot-scope="{ invalid, validate }" @submit.prevent="validate().then(submit)">
  + <form slot-scope="{ invalid, validate }" @submit.prevent="validate(submit)">
  <InputWithValidation rules="required" v-model="first" :error-messages="errors" />
  <InputWithValidation rules="required" v-model="second" :error-messages="errors" />
  @@ -90,6 +90,8 @@ If you plan to trigger validation from the template without using `refs` you can
  </template>
  ```
  +As you have guessed, the `validate` method on the Observer's slot-scope takes a callback that runs after the validation passes.
  +
  ::: tip
  Using the same approach you can reset validation state for all providers using the public method `reset()`.
  :::
  