Documentary films are having a moment — a big one. This year, Won’t You Be My Neighbor?, a portrait of the enduring kids’ show host, Fred Rogers, directed by Morgan Neville, 51 (an Oscar winner for 2013’s 20 Feet from Stardom), grossed $22.6 million domestically. Fans of Supreme Court Justice Ruth Bader Ginsburg flocked to RBG, on which Julie Cohen, 54, worked, as it collected $14 million. And even though Three Indentical Strangers has no “names” — the film by Tim Wardle, 40, tells of the stranger-than-fiction tale of three brothers, triplets separated at birth — it intrigued audiences enough to gross $12.3 million. In October, the filmmakers, at THR’s invitation, came together to compare notes — along with Rashida Jones, 42, whose Quincy documents the life of her father,…