Snippet format update

To match the starter (for the migration)

snippets/toggleClass.md

@@ -1,4 +1,7 @@
-### toggleClass
+---
+title: toggleClass
+tags: browser,beginner
+---
 
 Toggle a class for an element.
 
@@ -10,4 +13,4 @@ const toggleClass = (el, className) => el.classList.toggle(className);
 
 ```js
 toggleClass(document.querySelector('p.special'), 'special'); // The paragraph will not have the 'special' class anymore
-```
+```