Fix typo docs[zh] about attention.md.
Author: zhanluxianshen
Pull request: yes

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Fixes # (issue)


## Before submitting
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Comments:
Hi 👋, thank you for opening this pull request! The pull request is converted to draft by default. When it is ready for review, please click the `Ready for review` button (at the bottom of the PR page).

cc @stevhliu!

Thanks for your PR, I can't read Chinese though 🙈!

@Isotr0py, would you mind taking a quick look please?

@Isotr0py Thanks the tips.