fix(challenges): commented output was wrong

Nirajn2311 · scissorsneedfoodtoo · commit 3cb972ecee6b · 2018-09-13T20:22:45.000+09:00
diff --git a/challenges/02-javascript-algorithms-and-data-structures/es6.json b/challenges/02-javascript-algorithms-and-data-structures/es6.json
@@ -562,7 +562,7 @@
             "  };",
             "})();",
             "console.log(increment(5, 2)); // returns 7",
-            "console.log(increment(5)); // returns NaN"
+            "console.log(increment(5)); // returns 6"
           ],
           "head": [],
           "tail": []
