MIAMI — When Miami Heat coach Erik Spoelstra talks about the ones that got away, he’s not just discussing the losses that have contributed to the 6-7 record the Heat take into Sunday’s game against the visiting Dallas Mavericks after this five-day break. It’s also about the offensive rebounds and the second-chance points by the opposition that have created this place in the standings. In that regard, the turn for the better has been tangible.