Snippet format update

To match the starter (for the migration)

snippets/maxN.md

@@ -1,4 +1,7 @@
-### maxN
+---
+title: maxN
+tags: array,math,beginner
+---
 
 Returns the `n` maximum elements from the provided array.
 If `n` is greater than or equal to the provided array's length, then return the original array (sorted in descending order).
@@ -14,4 +17,4 @@ const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n);
 ```js
 maxN([1, 2, 3]); // [3]
 maxN([1, 2, 3], 2); // [3,2]
-```
+```