Jenna Coker-Jones and Christopher Kale Jones in Little Shop. What happens when a show often relegated to high school auditoriums gets main stage treatment? Well for one thing, that man-eating plant sure looks impressive. Everything, really, about this Ford’s Theatre production of Little Shop of Horrors feels like it’s been taken up a notch from whatever previous incarnation you might be familiar with (the 2003 Broadway revival being a possible exception). The show-stopping doo…