There are still several months before Avengers: Doomsday arrives in theaters, but that didn’t stop Chris Evans from giving fans a little teaser. During a recent Q&A at Fan Expo Boston over the weekend, the actor, who reprises his role as Steve Rogers/Captain America in the upcoming Marvel blockbuster, said that his character’s storyline is “brutal.” “The Russos love beating up Steve Rogers,” Evans said of the Russo Brothers, who are helming Doomsday. “Their favorite thing to do is to just beat the crap out of him. To them, that’s what makes a hero, and that’s someone who gets punched so many times but still gets up. So they keep finding…