Where are appDir docs files?

[mortal basin]

Hi, where I can find docs files for "/app" approach in nextjs repo? I want to fix some typos but I see only files for "/pages" docs. Does documentation for appDir is in the nextjs main repo whether somewere else?

[marble urchin]

https://nextjs.org/docs

there is a dropdown below the search input to select which router you want to use

ah do you mean the source code?