feat(tutorial): better explanation of component events

site/content/tutorial/05-events/04-component-events/text.md

@@ -18,4 +18,8 @@ Components can also dispatch events. To do so, they must create an event dispatc
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-> `createEventDispatcher` must be called when the component is first instantiated — you can't do it later inside e.g. a `setTimeout` callback. This links `dispatch` to the component instance.
+> `createEventDispatcher` must be called when the component is first instantiated — you can't do it later inside e.g. a `setTimeout` callback. This links `dispatch` to the component instance.
+
+Notice how the `App.svelte` component, that is including `Inner.svelte`, is listening to the messages dispatched by `Inner` thanks to the `on:message` attribute.
+
+> Without this attribute, messages would still be dispatched, but the App would not react to it. Try removing the `on:message` attribute and pressing the button again!