LAKE BUENA VISTA, Fla. — Down by 14 in Game 1, the Miami Heat found a way. Down by 17 in Game 2, they did it again Thursday night. And after making the Boston Celtics lose another big lead on the court — as well as their cool in the postgame locker room — the unheralded Heat are two wins away from the NBA Finals. Goran Dragic scored 25 points, Bam Adebayo led a big third-quarter rally to finish with 21, and the Heat pulled off another comeback to beat the Celtics 106-101 and take a 2-0 lead in the Eastern Conference finals. “We got grit,” Adebayo said.