feat/ clarify that we would normally use math.isnan

Author: nik-rev

14_contains/solution/contains-solution.js

@@ -1,7 +1,7 @@
 const contains = function(obj, searchValue) {
   const values = Object.values(obj);
 
-  // NaN !== NaN, so we would usually have to do an explicit check to test for it. However, Array.prototype.includes handles that for us
+  // NaN !== NaN, so we would usually have to do an explicit check with Math.isNaN to test for it. However, Array.prototype.includes handles that for us
   if (values.includes(searchValue)) return true;
 
   const nestedObjects = values.filter((value) => typeof value === 'object');