[mkdocs] - rebuild docs automatically on update

One of the benefits of our current docs for contributors if you are working on a doc and make some change to an example or some text, jekyll rebuilds the documentation automatically and you can see the change in your browser.

With how mkdocs is implemented on the live-docs branch you need to stop the mkdocs server, rebuild the docs using make examples and then restart the server (mkdocs serve)

从 live-docs 分支开始，检查当前如何使用 make examples 和 mkdocs serve。跟踪文档重新构建流程，并将其与所描述的 Jekyll 行为进行比较；完成的标准是，示例或文本的更改会在浏览器中显示，而无需手动停止、重新构建和重新启动服务器。