Update attribute-directives.md

[Lukeeeeeeeeee]

修改错别单词

注意：

1. 新版本的文档位于aio分支下，master分支下是老版本的文档。
2. 原则上不再接受对老版本的PR。

[googlebot]

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[Lukeeeeeeeeee]

I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.