The late Fred Rogers would be proud of the booming box office neighborhood populated by documentaries in 2018. Won’t You Be My Neighbor?, chronicling the life and career of the gentle, open-minded kids TV host, quickly became the No. 6 doc of all time, excluding nature and concert pics. It wasn’t the only summer surprise: Ruth Bader Ginbsburg film RBG, opening a month earlier in May, also landed on the top 10 list of best-performing docs. They were followed by Three Identical Strangers and Free Solo. However, one doc voted off the marquee was Michael Moore’s Trumpera treatise, Fahrenheit 11/9. On the narrative feature side, it was a challenging year. The hope now is that indie films opening over the Christmas holiday will be buoyed by the final stretch of…