Dallas Cowboys owner Jerry Jones offered up some concerning news on star defensive end Sam Williams on Sunday. The franchise won’t know about his knee until after his MRI on Sunday afternoon. But Jones added, “Didn’t like what we saw,” according to Jon Machota. Williams went down with an apparent left knee injury during practice Sunday and had to be carted off the field, per Jon Machota of The Athletic. While the severity of the injury is currently unknown, it was described as “not good” from someone who saw it live, according to Nick Harris of Cowboys.com. Williams sustained the injury taking…