Republican Senate candidate Tim Sheehy claims he suffered a gunshot wound while serving as a Navy SEAL in Afghanistan — but newly revealed documents suggest he’s been caught in a lie. The decorated war veteran says he was hit, possibly by friendly fire, by a ricochet bullet during a 2012 firefight. The Washington Post revealed earlier this month that Sheehy actually reported to officials that he shot himself in the arm three years later when he accidentally discharged a firearm in Montana’s Glacier National Park — an account he told the newspaper was a “lie” he’d made up, “To protect himself a…