docs: fix broken link in README.md

README.md

@@ -266,7 +266,7 @@ pub fn some_tool() -> Result<Version> {
 }
 ```
 
-To construct your own simple adhoc error use the [miette!] macro:
+To construct your own simple adhoc error use the [`miette!`] macro:
 ```rust
 // my_app/lib/my_internal_file.rs
 use miette::{miette, Result};