also change readme-cn

Author: yihong0618

README.md

@@ -40,7 +40,7 @@
 
 - Simply click `Sign in to LeetCode` in the `LeetCode Explorer` will let you **sign in** with your LeetCode account.
 
-- You can also use the following command to sign in/cookie in/out:
+- You can also use the following command to sign in/sign in (by cookie)/out:
   - **LeetCode: Sign in**
   - **LeetCode: Sign in (by cookie)**
   - **LeetCode: Sign out**

docs/README_zh-CN.md

@@ -40,8 +40,9 @@
 
 - 点击 `LeetCode Explorer` 中的 `Sign in to LeetCode` 即可登入。
 
-- 你也可以使用下来命令登入或登出:
+- 你也可以使用下来命令登入或利用cookie登入或登出:
   - **LeetCode: Sign in**
+  - **LeetCode: Sign in (by cookie)**
   - **LeetCode: Sign out**
 
 ---