Brian Steinberg Senior TV EditorBloomberg News on Thursday began notifying a group of employees they were being terminated, according to three people familiar with the matter, the latest in an ongoing string of layoffs at media companies as they grapple with the economics of the digital age.Some staffers were given the sense the company hoped to enact a restructuring among a group of veteran editors, according to one of these people, who noted that some employees affected had been with