fix readme

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

MalikHou seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[yfaming]

中英文空格好像不太一致？有的地方空格，有点地方没有。可以一下。其他 LGTM

[yfaming]

docs/cn/cluster_deployment.md 这个文件里没内容？

[yfaming]

LGTM