More than two months after Alex Trebek’s death, fans of “Jeopardy!” finally got the chance to say goodbye.A video tribute to the host closed Friday’s episode of the quiz show, the final one that Trebek taped before pancreatic cancer claimed his life on Nov. 8.The 90-second montage, set to Hugh Jackman singing the Peter Allen song “Once Before I Go,” is a lighthearted and laughter-filled