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/languages/src/elixir.rs

@@ -358,7 +358,7 @@ impl LspAdapter for NextLspAdapter {
             }
             futures::io::copy(response.body_mut(), &mut file).await?;
 
-            // todo!("windows")
+            // todo("windows")
             #[cfg(not(windows))]
             {
                 fs::set_permissions(