Recently on Twitter, a user asked their followers to name the best documentaries of the decade.  Instead, I named three notable documentarians who have produced excellent work.  One of those mentioned filmmakers was Brett Morgen.  Morgen has made one of the best docs about Hollywood history (The Kid Stays in the Picture), one of the best docs about music history (Kurt Cobain: Montage of Heck), and with his latest project Jane, he’s made one of the best…