docs: Update helpers.md (#1294)

* Remove racist example in docs/helpers.md

* Update helpers.md

Co-authored-by: 沈唁 <52o@qq52o.cn>
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Doc Oliver 2020-07-20 03:11:53 -04:00 committed by GitHub
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@ -124,7 +124,7 @@ Only when you both set the `routerMode: 'history'` and `externalLinkTarget: '_se
## Customise ID for headings
```md
### 你好,世界! :id=hello-world
### Hello, world! :id=hello-world
```
## Markdown in html tag