Fix typos

Co-Authored-By: Yuki Okushi <huyuumi.dev@gmail.com>
Co-Authored-By: Chris Simpkins <git.simpkins@gmail.com>

Author: 3 people

src/SUMMARY.md

@@ -58,7 +58,7 @@
         - [Lowering AST to HIR](./lowering.md)
         - [Debugging](./hir-debugging.md)
     - [The MIR (Mid-level IR)](./mir/index.md)
-        - [HAIR MIR construction](./mir/construction.md)
+        - [HAIR and MIR construction](./mir/construction.md)
         - [MIR visitor and traversal](./mir/visitor.md)
         - [MIR passes: getting the MIR for a function](./mir/passes.md)
     - [Closure expansion](./closure.md)

src/part-2-intro.md

@@ -6,7 +6,7 @@ of compilation works. They should be friendly to both readers interested in the
 end-to-end process of compilation _and_ readers interested in learning about a
 specific system they wish to contribute to. If anything is unclear, feel free
 to file an issue on the [rustc-dev-guide
-repo](https://github.com/rust-lang/rustc-dev-guide) or contact the compiler
+repo](https://github.com/rust-lang/rustc-dev-guide/issues) or contact the compiler
 team, as detailed in [this chapter from Part 1](./compiler-team.md).
 
 In this part, we will specifically look at the high-level architecture of the