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.