message: docs(Dialog): fix before-close description
diff: @@ -72,7 +72,7 @@ Dialog.alert({
  ### Asnyc Close
  ```js
  -const beforeClose = (action, done) =>
  +const beforeClose = (action) =>
  new Promsie((resolve) => {
  setTimeout(() => {
  resolve(action === 'confirm');
  @@ -157,7 +157,7 @@ export default {
  | closeOnClickOverlay | Whether to close when overlay is clicked | _boolean_ | `false` |
  | lockScroll | Whether to lock body scroll | _boolean_ | `true` |
  | allowHtml `v2.8.7` | Whether to allow HTML rendering in message | _boolean_ | `false` |
  -| beforeClose | Callback function before close,<br>call done() to close dialog,<br>call done(false) to cancel loading | (action: string, done: Function) => void | - |
  +| beforeClose | Callback function before close | _(action) => boolean \| Promise_ | - |
  | transition | Transition, equivalent to `name` prop of [transtion](https://v3.vuejs.org/api/built-in-components.html#transition) | _string_ | - |
  | teleport | Return the mount node for Dialog | _string \| Element_ | `body` |
  