[tor-relays] update installation guide please

[nusenu]

I:
> https://www.torproject.org/docs/debian.html.en still says ....ject.org 
> tor-experimental-0.3.1.x-stretch main which update can't find.

https://trac.torproject.org/projects/tor/ticket/23612

I asked in the past about a repo for 'current alpha' but the request has
been turned down.
With the new release cycle this would be even more relevant.


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