Snippet format update

To match the starter (for the migration)

snippets/rearg.md

@@ -1,4 +1,7 @@
-### rearg
+---
+title: rearg
+tags: adapter,function,intermediate
+---
 
 Creates a function that invokes the provided function with its arguments arranged according to the specified indexes.
 
@@ -16,4 +19,4 @@ var rearged = rearg(
   [2, 0, 1]
 );
 rearged('b', 'c', 'a'); // ['a', 'b', 'c']
-```
+```