Taking a page from other workplace TV mockumentaries, NBC’s “St. Denis Medical” follows the overburdened staff of a hospital in Scranton. Sorry, I meant small-town Oregon. But if the rhythms and delivery mimic “The Office” at the outset, I’m willing to chalk that up to a new show needing time to find its footing. A more cynical possibility is that NBC saw the wildly successful second life of “The Office” on streaming and sought out a show just like it. Either way, here’s hoping “St. Denis Medical” can develop a more distinctive voice of its