Hi. Reactive chapter is duplicated in the side menu. Is this as expected? If not, I'll fix it, but which is correct, `Internals` or `Advanced Guides`? Config is here. https://github.com/vuejs/docs-next/blob/master/src/.vuepress/config.js#L48 https://github.com/vuejs/docs-next/blob/master/src/.vuepress/config.js#L71 <img width="500" alt="スクリーンショット 2020-07-22 6 18 40" src="https://user-images.githubusercontent.com/11070996/88108119-455da080-cbe3-11ea-9326-02c8c446799c.png">