Improve reference documentation for ContextClosedEvent

Closes gh-23436

src/docs/asciidoc/core/core-beans.adoc

@@ -8624,10 +8624,10 @@ The following table describes the standard events that Spring provides:
   `start()` call.
 
 | `ContextClosedEvent`
-| Published when the `ApplicationContext` is closed by using the `close()` method on the
-  `ConfigurableApplicationContext` interface. Here, "`closed`" means that all singleton
-  beans are destroyed. A closed context reaches its end of life. It cannot be refreshed
-  or restarted.
+| Published when the `ApplicationContext` is being closed by using the `close()` method
+  on the `ConfigurableApplicationContext` interface or via a JVM shutdown hook. Here,
+  "closed" means that all singleton beans will be destroyed. Once the context is closed,
+  it reaches its end of life and cannot be refreshed or restarted.
 
 | `RequestHandledEvent`
 | A web-specific event telling all beans that an HTTP request has been serviced. This