Update docs for ControllerAdvice

In 5.3 it became possible to handle exceptions from any handler through
ExceptionHandler's in a ControllerAdvice class, but this is not
mentioned in the docs

See gh-22619, gh-27338

src/docs/asciidoc/web/webmvc.adoc

@@ -4021,27 +4021,25 @@ necessary methods, and declare it as a Spring bean.
 === Controller Advice
 [.small]#<<web-reactive.adoc#webflux-ann-controller-advice, WebFlux>>#
 
-Typically `@ExceptionHandler`, `@InitBinder`, and `@ModelAttribute` methods apply within
+`@ExceptionHandler`, `@InitBinder`, and `@ModelAttribute` methods apply only to the
-the `@Controller` class (or class hierarchy) in which they are declared. If you want such
+`@Controller` class, or class hierarchy, in which they are declared. If, instead, they
-methods to apply more globally (across controllers), you can declare them in a class
+are declared in an `@ControllerAdvice` or `@RestControllerAdvice` class, then they apply
-annotated with `@ControllerAdvice` or `@RestControllerAdvice`.
+to any controller. Moreover, as of 5.3, `@ExceptionHandler` methods in `@ControllerAdvice`
+can be used to handle exceptions from any `@Controller` or any other handler.
 
-`@ControllerAdvice` is annotated with `@Component`, which means such classes can be
+`@ControllerAdvice` is meta-annotated with `@Component` and therefore can be registered as
-registered as Spring beans through <<core.adoc#beans-java-instantiating-container-scan,
+a Spring bean through <<core.adoc#beans-java-instantiating-container-scan,
-component scanning>>. `@RestControllerAdvice` is a composed annotation that is annotated
+component scanning>>. `@RestControllerAdvice` is meta-annotated with `@ControllerAdvice`
-with both `@ControllerAdvice` and `@ResponseBody`, which essentially means
+and `@ResponseBody`, and that means `@ExceptionHandler` methods will have their return
-`@ExceptionHandler` methods are rendered to the response body through message conversion
+value rendered via response body message conversion, rather than via HTML views.
-(versus view resolution or template rendering).
 
-On startup, the infrastructure classes for `@RequestMapping` and `@ExceptionHandler`
+On startup, `RequestMappingHandlerMapping` and `ExceptionHandlerExceptionResolver` detect
-methods detect Spring beans annotated with `@ControllerAdvice` and then apply their
+controller advice beans and apply them at runtime. Global `@ExceptionHandler` methods,
-methods at runtime. Global `@ExceptionHandler` methods (from a `@ControllerAdvice`) are
+from an `@ControllerAdvice`, are applied _after_ local ones, from the `@Controller`.
-applied _after_ local ones (from the `@Controller`). By contrast, global `@ModelAttribute`
+By contrast, global `@ModelAttribute` and `@InitBinder` methods are applied _before_ local ones.
-and `@InitBinder` methods are applied _before_ local ones.
 
-By default, `@ControllerAdvice` methods apply to every request (that is, all controllers),
+The `@ControllerAdvice` annotation has attributes that let you narrow the set of controllers
-but you can narrow that down to a subset of controllers by using attributes on the
+and handlers that they apply to. For example:
-annotation, as the following example shows:
 
 [source,java,indent=0,subs="verbatim,quotes",role="primary"]
 .Java