Rollup merge of #57212 - phansch:improve_rustc_book_contributing, r=steveklabnik

docs(rustc): Link to the book's source in rustc

This makes the source of [the rustc book](https://doc.rust-lang.org/rustc/what-is-rustc.html) book a bit more discoverable.
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Mazdak Farrokhzad 2019-01-18 22:56:37 +01:00 committed by GitHub
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# Contributing to rustc
We'd love to have your help improving `rustc`! To that end, we've written [a
whole book](https://rust-lang.github.io/rustc-guide/) on its
whole book][rustc_guide] on its
internals, how it works, and how to get started working on it. To learn
more, you'll want to check that out.
If you would like to contribute to _this_ book, you can find its source in the
rustc source at [src/doc/rustc][rustc_book].
[rustc_guide]: https://rust-lang.github.io/rustc-guide/
[rustc_book]: https://github.com/rust-lang/rust/tree/master/src/doc/rustc