Update rewrite docs and cleanup

src/ReactorMaintenance.Simulation/Balancing.cs

@@ -1,4 +1,4 @@
-using ReactorMaintenance.Simulation.Difficulties;
+using ReactorMaintenance.Simulation.Difficulties;
 
 namespace ReactorMaintenance.Simulation;
 
@@ -158,4 +158,4 @@ public abstract class Balancing
     public abstract int RemedyBlockTurns { get; }
     public abstract int HeatShieldSteps { get; }
     public abstract int InventoryCapacityPerRemedy { get; }
-}
+}