GUAYAQUIL, Ecuador—Ecuadorian sprinter Alex Quiñónez was fatally shot in the port city of Guayaquil, police said Saturday. Quiñónez, who was 32, became a national hero in 2012 when he reached the 200-meter final at the London Games, finishing seventh in a race won by Usain Bolt. Guayaquil-based newspaper El Universo reported that Quiñónez was fatally…