Edit "What the compiler does to your code" (#1306)
Edit "What the compiler does to your code" (#1306)

* Edit overview.md

* Fix lexer crate

* Edit wording

Co-authored-by: pierwill <a7ab10e8301cd563cb2146de24e8a000ef071fe2@users.noreply.github.com>
rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide