Removed unnecessary parentheses around typeof

Author: Trinityyi

snippets/deepFreeze.md

@@ -12,7 +12,7 @@ Finally, use `Object.freeze()` to freeze the given object.
 ```js
 const deepFreeze = obj => {
   Object.keys(obj).forEach(prop => {
-    if (typeof(obj[prop]) === 'object') deepFreeze(obj[prop]);
+    if (typeof obj[prop] === 'object') deepFreeze(obj[prop]);
   });
   return Object.freeze(obj);
 };