docs(store): document new behavior of createReducer for multiple acti…

…ons of the same type (#2146)

Closes #2144

modules/store/src/reducer_creator.ts

@@ -202,8 +202,7 @@ export function on(
  * @usageNotes
  *
  * - Must be used with `ActionCreator`'s (returned by `createAction`).  Cannot be used with class-based action creators.
- * - An action type should only be associated with at most one state change function, similar to switch statements.
- *   - In the case this is violated, the latest defined associated will be used (the latest `on` function passed).
+ * - An action can be associated with multiple state change functions. In this case the functions will be executed in the specified order.
  * - The returned `ActionReducer` should additionally be returned from an exported `reducer` function.
  * This is because [function calls are not supported](https://angular.io/guide/aot-compiler#function-calls-are-not-supported) by the AOT compiler.
  *