If you’re going to the Patriots/Broncos game at Gillette Stadium Sunday night, do yourself a favor: Stay in your seat at the end of the first quarter. We’re told that the trailer for “Travis: A Soldier’s Story” will be shown on the big screen, and the teaser for the inspirational tale of Staff Sergeant Travis Mills is worth watching. Mills lost all four limbs in an explosion in Afghanistan in 2012, but is slowly putting his life and body back together.Mark Shanahan can be reached at email@example.com. Follow him on Twitter @MarkAShanahan. Meredith Goldstein can be reached at firstname.lastname@example.org. Follow her on Twitter @MeredithGoldste.