Snippet format update

To match the starter (for the migration)

snippets/isSorted.md

@@ -1,4 +1,7 @@
-### isSorted
+---
+title: isSorted
+tags: array,intermediate
+---
 
 Returns `1` if the array is sorted in ascending order, `-1` if it is sorted in descending order or `0` if it is not sorted.
 
@@ -21,4 +24,4 @@ const isSorted = arr => {
 isSorted([0, 1, 2, 2]); // 1
 isSorted([4, 3, 2]); // -1
 isSorted([4, 3, 5]); // 0
-```
+```