Snippet format update

To match the starter (for the migration)

snippets/permutations.md

@@ -1,4 +1,7 @@
-### permutations
+---
+title: permutations
+tags: array,recursion,advanced
+---
 
 ⚠️ **WARNING**: This function's execution time increases exponentially with each array element. Anything more than 8 to 10 entries will cause your browser to hang as it tries to solve all the different combinations.
 
@@ -24,4 +27,4 @@ const permutations = arr => {
 
 ```js
 permutations([1, 33, 5]); // [ [ 1, 33, 5 ], [ 1, 5, 33 ], [ 33, 1, 5 ], [ 33, 5, 1 ], [ 5, 1, 33 ], [ 5, 33, 1 ] ]
-```
+```