ORLANDO, Fla. — Just watched the HBO film on Magic Johnson and Larry Bird. It’s tremendous. Full marks to the people at HBO. It’s on at 8 p.m. in Southern California. Do yourself a favor and watch. If you’re old enough to have experienced their rivalry as it unfolded, it will bring back a flood of memories. If you aren’t old enough, it will open your eyes to the ways two men changed a sport for the better.