By John Strege Was Jordan Spieth summoning his instructor Cameron McCormick back to Augusta National after Saturday’s third round an ominous sign?  Golf Channel’s Brandel Chamblee sounded the alarm on Live From the Masters on Sunday morning.  “Having his teacher out here could prove to be beneficial,” Chamblee said. “Maybe they find the answer. But it also could prove to be taxing to him, thinking too much about his golf swing as this tournament unfolds.”As the final round of the Masters