message: docs: correct example for demo exports
diff: @@ -43,8 +43,8 @@ any output produced by `default`.
  ```js
  module.exports = {
  default: () => {},
  - html: `<h1 class="hello-world">Hello World</h1>`,
  - css: `.hello-world { font-family: sans-serif; color: cornflowerblue; }`
  + html: () => `<h1 class="hello-world">Hello World</h1>`,
  + css: () => `.hello-world { font-family: sans-serif; color: cornflowerblue; }`
  }
  ```
  