Auto merge of #1511 - arcalinea:document-hidden-service-in-tor.md, r=bitcartel

Tor.md: change alpha to beta testnet, add new zcash hidden service address

Note: When @ageis and I checked this the other day, we were getting multiple peer connections. Think we said we'd change this before launch, so I opened issue #1510. Leaving documentation to expect a single peer.