PHILADELPHIA — Joel Embiid underwent surgery Monday to repair the torn ligament in his right thumb, the 76ers said. The injury, which was officially listed as a thumb sprain, occurred during Game 3 of the Sixers’ first-round playoff series against the Toronto Raptors. The MVP runner-up hit the game-winning shot that night and continued to play through the injury with tape around his thumb and wrist. The Sixers said Embiid also underwent a procedure to repair an injury to his left index finger. The recovery timeline from both procedures is not expected to impact Embiid’s availability for traini…