clarify relationship between learn and send in example config

[zephyrtronium]

          Oh, I think I understand what you meant with learn and send

Updating them

# learn is the tag used to learn Markov chain data from this channel.
learn = 'finleyfisch'
# send is the tag used to generate messages.
send = 'finleyfisch'

If this is what you meant, then I might have been confused by the comment

Originally posted by @seth-rah in #76 (comment)