The first trailer for Oprah Winfrey’s forthcoming documentary of late, great actor Sidney Poitier is out — and it tugs at the heartstrings. In one excerpt from the clip, the media mogul breaks down in tears when discussing the Hollywood trailblazer she considered a close friend. “That’s the summary of him, I love him so much,” she says. Directed by Reginald Hudlin, “Sidney,” explores Poitier’s journey from his early life in the Bahamas to becoming a movie pioneer and civil rights activist. “I left the Bahamas with this sense of myself,” Poitier said in an interview. “And from the time I got of...