Update article.md

Author: iliakan

2-ui/5-loading/01-onload-ondomcontentloaded/article.md

@@ -145,7 +145,7 @@ let analyticsData = { /* object with gathered data */ };
 
 window.addEventListener("unload", function() {
   navigator.sendBeacon("/analytics", JSON.stringify(analyticsData));
-};
+});
 ```
 
 - The request is sent as POST.