Snippet format update

To match the starter (for the migration)

snippets/functions.md

@@ -1,4 +1,7 @@
-### functions
+---
+title: functions
+tags: object,function,intermediate
+---
 
 Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.
 
@@ -23,4 +26,4 @@ function Foo() {
 Foo.prototype.c = () => 3;
 functions(new Foo()); // ['a', 'b']
 functions(new Foo(), true); // ['a', 'b', 'c']
-```
+```