Tripping on muscle relaxants and peyote on the beach, two discarded wives portrayed by Jane Fonda and Lily Tomlin work through their anger and heartbreak and then ask “now what?” How an uptight Grace (Fonda) and a bohemian Frankie (Tomlin) bounce back from the indignity of abandonment by their husbands at an advanced age is the comic fodder for the new Netflix Inc series “Grace and Frankie” that debuts Friday with 13 episodes available for streaming. Enjoying an easy rapport 35 years after the two teamed up with Dolly Parton in working women revenge comedy “9 to 5,” Fonda, 77, and Tomlin, 75, revel in the rare opportunity to showcase women of a certain age.