Update src/rustc-driver-interacting-with-the-ast.md

Co-Authored-By: Who? Me?! <mark-i-m@users.noreply.github.com>

src/rustc-driver-interacting-with-the-ast.md

@@ -1,4 +1,4 @@
-# Interacting with the AST
+# Example: Type checking through `rustc_interface`
 
 `rustc_interface` allows you to interact with Rust code at various stages of compilation.
 
@@ -38,4 +38,4 @@ rustc_interface::run_compiler(config, |compiler| {
         })
     });
 });
-```
+```