docs: Update README.md (LeetCode-OpenSource#637)

Peng-Yu Chen · jdneo · web-flow · commit ce928666ef55 · 2021-06-03T10:34:21.000+08:00
Co-authored-by: Sheng Chen &lt;sheche@microsoft.com&gt;
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ Recently we observed that [the extension cannot login to leetcode.com endpoint a
 
 Thanks for [@yihong0618](https://github.com/yihong0618) provided a workaround which can somehow mitigate this. Now you can simply click the `Sign In` button and then select `Third Party` login or `Cookie` login.
 
-> Note: If you want to use third-party login(**Recommended**), please make sure your account has been connected to the thrid-party. If you want to use `Cookie` login, click [here](https://github.com/LeetCode-OpenSource/vscode-leetcode/issues/478#issuecomment-564757098) to see the steps.
+> Note: If you want to use third-party login(**Recommended**), please make sure your account has been connected to the third-party. If you want to use `Cookie` login, click [here](https://github.com/LeetCode-OpenSource/vscode-leetcode/issues/478#issuecomment-564757098) to see the steps.
 
 ## Requirements
 - [VS Code 1.30.1+](https://code.visualstudio.com/)
