message: docs: add a blank line
  Add a line to make the document look more harmonious
diff: @@ -76,6 +76,7 @@ Get started with the [documentation](https://router.vuejs.org).
  - Via CDN: `<script src="https://unpkg.com/vue-router@4"></script>`
  - In-browser playground on [CodeSandbox](https://codesandbox.io/s/vue-router-4-reproduction-hb9lh)
  - Add it to an existing Vue Project:
  +
  ```bash
  npm install vue-router@4
  ```
  