monoblue: add a link to the latest file revision
For reference, this was added to paper/coal in
bb00a159e594 and to gitweb in
b3b57ecbda50.
discovery: reference relevant bug in the faulty code
We extend the comment about this code flaw with more code flaw.
discovery: fix a typo in a comment
The idea here is that the code is imperfect, not that it is impossible to get
something behaving properly.