The much-anticipated documentary "The New York Times Presents: "Broken Horses" will debut on the FX Network Friday at 10 p.m ET and will begin streaming on Hulu next day. What follows is a review of the documentary. You probably haven't seen the FX documentary "The New York Times Presents: "Broken Horses" yet, but, then again, you have. Be it from 60 Minutes, HBO's Real Sports, the Washington Post or in the pages of the New York Times, the story of horse racing's problems has been told numerous times. It's not...