Towards the end of the fifth episode of Fosse/Verdon — the FX limited series that chronicles the personal lives of the legendary Broadway duo— actress/dancer Gwen Verdon (Michelle Williams) tells her choreographer husband’s new girlfriend exactly how he operates. “See here’s the thing about Bob; he’s so sweet and he’s so charming. He tells you whatever you want to hear, and then you realize he’s a liar,” she says flatly about Fosse (Sam Rockwell). He wants to be free, she explains, for his art (heavily implied air quotes). “And what do you get in …