Actually, this was sent by "Takedown Piracy LLC" working on behalf of Wickedpictures. They file DMCA notices by the truckload according to the results I get in Chilling Effect's search, so you can safely assume they're a DMCA notice spammer.
Unfortunately, it does not list the individual lawyer who signed off on this complaint, or I would be tempted to draft a letter to their local bar association pointing out how careless they are, as no reasonable person could mistake Github's documentation for a porno movie.
Wicked might be paying them to do it, and if they're charging "per infringing URL removed", it makes a lot of sense that they're trying to get as many removed as possible. Wicked might also be a victim in this case.
Unfortunately, it does not list the individual lawyer who signed off on this complaint, or I would be tempted to draft a letter to their local bar association pointing out how careless they are, as no reasonable person could mistake Github's documentation for a porno movie.