Update concepts.md

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Basil Hendroff 2021-02-13 23:57:50 +08:00 committed by GitHub
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@ -186,6 +186,8 @@ If multiple sites share the same definition, you can list all of them together:
localhost:8080, example.com, www.example.com 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,
or or
```caddy ```caddy