message: docs: correct iconAssets config value
diff: @@ -70,7 +70,7 @@ Locales config for BackToTop button.
  - Type: `string`
  - Required: No
  -Link of font icon asset, `'iconfont'` and `'font-awesome'` keywords are supported.
  +Link of font icon asset, `'iconfont'` and `'fontawesome'` keywords are supported.
  ## iconPrefix
  