message: chore(demo): update markdown page
diff: @@ -62,6 +62,8 @@ npm i -D vuepress-theme-hope
  ::::
  +::::: details Code
  +
  ````md
  :::: code-group
  @@ -84,6 +86,8 @@ npm i -D vuepress-theme-hope
  ::::
  ````
  +:::::
  +
  - [View Detail](https://vuepress-theme-hope.github.io/guide/markdown/code-group/)
  ### Align
  