Snippet format update

To match the starter (for the migration)

snippets/symmetricDifferenceWith.md

@@ -1,4 +1,7 @@
-### symmetricDifferenceWith
+---
+title: symmetricDifferenceWith
+tags: array,function,intermediate
+---
 
 Returns the symmetric difference between two arrays, using a provided function as a comparator.
 
@@ -17,4 +20,4 @@ symmetricDifferenceWith(
   [1.9, 3, 0, 3.9],
   (a, b) => Math.round(a) === Math.round(b)
 ); // [1, 1.2, 3.9]
-```
+```