[riot-notifications] [RIOT] examples/gnrc_border_router: README fixes (#3980)

[Oleg Hahm]

>  ```
>  USEMODULE += gnrc_slip
>  ```
> -by something like
> +with something like

Ok, would you mind to open the PR also against the release branch?

---
Reply to this email directly or view it on GitHub:
https://github.com/RIOT-OS/RIOT/pull/3980/files#r40546500
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