The explanation of Rustdoc internals is partially outdated

[TonalidadeHidrica]

I've been digging around the rustdoc internals docs and realized that some of the descriptions are outdated. I'm specifically mentioning about the ## From clean to crate chapter. For example, there's no longer html/render.rs file; it's been renamed to html/render/mod.rs as of 6a4396b. Moreover, the renamed file a function called run(). I don't know which function is the current entrypoint.