Betsy West and Julie Cohen , the filmmakers behind “RBG” and “Julia,” will make “Top of the World,” a new documentary short for CNN Films and Time Studios . Set inside Windows on the World, the legendary restaurant atop the World Trade Center, the documentary short draws on the voices of those who worked there to capture a portrait of ambition, community, and resilience. Produced in association with Montalto Pictures, Tribeca Studios, and Storyville Films, Top of the World will premiere this fall in select theaters and on CNN. Its release coincides with the 25th anniversary of the September 11 terrorist attacks and the 50th anniversary of the opening of Windows on the World.…