Remove ! from todo!() in comments (#8643)

This practice makes it difficult to locate todo!s in my code when I'm
working. Let's take out the bang if we want to keep doing this.

Release Notes:

- N/A

crates/cli/src/main.rs

@@ -156,7 +156,7 @@ mod linux {
     }
 }
 
-// todo!("windows")
+// todo("windows")
 #[cfg(target_os = "windows")]
 mod windows {
     use std::path::Path;