We are just four months away from the release of Avengers: Doomsday, and now that Comic-Con has passed, we might not get much more info on the film until screenings begin. But Robert Downey Jr. is giving us a little tease to hint about the storyline between his character, Doctor Doom, and Chris Evans’ Steve Rogers/ Captain America.In a recent interview with Good Morning America at last weekend’s D23 event, Downey discussed his experience working…