Update concepts.md

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Basil Hendroff 2021-02-14 00:05:25 +08:00 committed by GitHub
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@ -186,7 +186,7 @@ If multiple sites share the same definition, you can list all of them together:
localhost:8080, example.com, www.example.com
```
Notice when addresses are listed on the same line, the comma is optional, however the space between addresses is not,
Notice when addresses are listed on the same line, the comma is optional, however, the space between addresses is not,
or