Update state-substate-scripts.md (#114)

Author: ItsLJcool

wiki/modding/scripting/state-substate-scripts.md

@@ -39,5 +39,5 @@ FlxG.switchState(new ModState("MyCustomState")); // assuming we have made a new
 ```
 or this code
 ```haxe
-openSubstate(new ModSubState("MyCustomSubstate")) // assuming we have made a new Script ./data/states/MyCustomSubstate.hx
-```
+openSubState(new ModSubState("MyCustomSubstate")) // assuming we have made a new Script ./data/states/MyCustomSubstate.hx
+```