This sixth episode of Fosse/Verdon is called “All I Care About Is Love,” taking its title from a song from the Broadway musical Chicago. That musical, in which Bob Fosse fashioned a later-career showcase for Gwen Verdon, is the subject of tonight’s episode – and so is the physical stress Fosse put himself under at the time. The movie All That Jazz, directed by Fosse himself, covered this ground already. This time, though, it’s done without changing the names.