add code tabs in node num3#2578

bishabosha merged 1 commit intoscala:mainscala/docs.scala-lang:mainfrom

benluo:_zh-cn/overviews/scala3-book/num3-code-tabsbenluo/docs.scala-lang:_zh-cn/overviews/scala3-book/num3-code-tabsCopy head branch name to clipboard