Snippet format update

To match the starter (for the migration)

snippets/sortedIndex.md

@@ -1,4 +1,7 @@
-### sortedIndex
+---
+title: sortedIndex
+tags: array,math,intermediate
+---
 
 Returns the lowest index at which value should be inserted into array in order to maintain its sort order.
 
@@ -16,4 +19,4 @@ const sortedIndex = (arr, n) => {
 ```js
 sortedIndex([5, 3, 2, 1], 4); // 1
 sortedIndex([30, 50], 40); // 1
-```
+```