Snippet format update

To match the starter (for the migration)

snippets/intersectionWith.md

@@ -1,4 +1,7 @@
-### intersectionWith
+---
+title: intersectionWith
+tags: array,function,intermediate
+---
 
 Returns a list of elements that exist in both arrays, using a provided comparator function.
 
@@ -10,4 +13,4 @@ const intersectionWith = (a, b, comp) => a.filter(x => b.findIndex(y => comp(x,
 
 ```js
 intersectionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)); // [1.5, 3, 0]
-```
+```