Expand THIR section with more details (#1183)
Expand THIR section with more details (#1183)

* Expand THIR section with more details
* Remove incorrect reference to `HirId`s

Co-authored-by: Léo Lanteri Thauvin <2bf4dd4fd1ac78de2e2ea32757849353d4735b98@gmail.com>
rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide