NONFICTION MINISERIES PREMIERE: ESPN’s 30 on 30 series presents a multi-part documentary examination of O.J. Simpson, a new take by director Ezra Edelman. (He directed HBO’s excellent documentary about the Magic Johnson-Larry Bird rivalry and friendship, Magic & Bird: A Courtship of Rivals.) ESPN’s parent company thought so much of this new documentary that, before showing the rest of the installments on ESPN, it’s launching the miniseries tonight on ABC, in prime time, with a two-hour opener.