message: Fix example from using v2 syntax
diff: @@ -108,11 +108,11 @@ You can use these flags to give your users a great experience, for example you c
  ```vue
  <ValidationProvider
  rules="required"
  - v-slot="{ flags }"
  + v-slot="{ changed }"
  >
  <input type="text" v-model="value">
  - <button :disabled="!flags.changed">Submit</button>
  + <button :disabled="!changed">Submit</button>
  </ValidationProvider>
  ```
  