Fix other typo in Sim Readme

sim/README.md

@@ -35,7 +35,7 @@ Writing to the simulator
 In a standard battle, what you write to the simulator looks something like this:
 
 ```
->start {"format":"gen7ou"}
+>start {"formatid":"gen7ou"}
 >player p1 {"name":"Alice","team":"insert packed team here"}
 >player p2 {"name":"Bob","team":"insert packed team here"}
 >p1 team 123456