README-zh_CN.md: fix the wrong answer for question 144

Fix lydiahallie#570

Author: ouhanyou

zh-CN/README-zh_CN.md

@@ -4696,7 +4696,7 @@ const person = {
 
 - A: 不需要，对象默认就是可迭代的
 - B: `*[Symbol.iterator]() { for (let x in this) yield* this[x] }`
-- C: `*[Symbol.iterator]() { for (let x in this) yield* Object.values(this) }`
+- C: `*[Symbol.iterator]() { yield* Object.values(this) }`
 - D: `*[Symbol.iterator]() { for (let x in this) yield this }`
 
 <details><summary><b>答案</b></summary>