message: docs: fix the refs example
diff: <template>
  <ValidationObserver ref="form">
  - <form @submit.prevent="handleSubmit(onSubmit)">
  + <form @submit.prevent="onSubmit">
  <ValidationProvider name="E-mail" rules="required|email" v-slot="{ errors }">
  <input v-model="email" type="email">
  <span>{{ errors[0] }}</span>
  