typo fixes
i2P doesn't currently have UPnP enabled in Tails

When I was testing months ago, I2P (in Tails) would never found any
compatible devices. Outside of Tails it has no problem opening ports on
my hardware router...so I disabled UPNP in Tails.

I'll try to revisit this later because it would be helpful (for I2P
users) to get UPnP to cooperate.