fix: 文案重复

[lihan178]

目标章节：1-js/06-advanced-functions/07-new-function/article.md

当前上游最新 commit：无

本 PR 所做更改如下：

文件名	参考上游 commit	更改（理由）
article.md	无	修改文字重复

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[songhn233]

@lihan178 Hey. Thanks for your contribution! We ask you to sign CLA so this PR can be merged.