Fix a bug in DispatchOnSet

ECS/Dispatcher/DispatcherOnChange.cs

@@ -12,7 +12,7 @@ namespace Svelto.ECS
             set
             {
                 if (EqualityComparer<T>.Default.Equals(value, _value) == false)
-                    base.value = _value;
+                    base.value = value;
             }
 
             get 

ECS/note.txt

@@ -1,7 +1,7 @@
 systems do not hold component data, but only system states
 systems cannot be injected
 systems are SRP and OCP
-systems communicates between component, mediators, producer/consumer, Svelto.ECS.Example.Observers. producer/consumer and observers must be defined in the layer of the engine.
+systems communicates between component, mediators, producer/consumer, observers. producer/consumer and observers must be defined in the layer of the engine.
 systems can have injected dependencies
 
 components don't have logic