Update src/overview.md

Co-authored-by: Yuki Okushi <jtitor@2k36.org>

Author: spastorino

src/overview.md

@@ -73,7 +73,7 @@ we'll talk about that later.
   of pairing up an impl with each reference to a trait) and [type
   checking] (the process of converting the types found in the HIR
   (`hir::Ty`), which represent the syntactic things that the user wrote,
-  into the internal representation used by the compiler (Ty<'tcx>)).
+  into the internal representation used by the compiler (`Ty<'tcx>`)).
 - The HIR is then [lowered to Mid-Level Intermediate Representation (MIR)][mir].
   - Along the way, we construct the THIR, which is an even more desugared HIR.
     THIR is used for pattern and exhaustiveness checking. It is also more