Are Marvel Avengers’ fans bold enough to be a Super Hero?  Doritos, a flagship brand from PepsiCo’s Frito-Lay division, is teaming with Marvel Studios for a bold new program that seeks to answer that question. It’s all part of a partnership to celebrate the upcoming nationwide release of “Marvel’s Avengers: Age of Ultron.” As an official partner, the Doritos brand will reveal new Avengers-themed video content, a sweepstakes to win experiences and rewards inspired by the film and exclusive digital…