Snippet format update

To match the starter (for the migration)

snippets/transform.md

@@ -1,4 +1,7 @@
-### transform
+---
+title: transform
+tags: object,array,intermediate
+---
 
 Applies a function against an accumulator and each key in the object (from left to right).
 
@@ -17,4 +20,4 @@ transform(
   },
   {}
 ); // { '1': ['a', 'c'], '2': ['b'] }
-```
+```