Mention @RegisterReflectionForBinding in the docs

Closes gh-32903

spring-boot-project/spring-boot-docs/src/docs/asciidoc/native-image/advanced-topics.adoc

@@ -141,7 +141,9 @@ include::code:MyRuntimeHints[]
 
 You can then use `@ImportRuntimeHints` on any `@Configuration` class (for example your `@SpringBootApplication` annotated application class) to activate those hints.
 
-
+If you have classes which needs binding (mostly needed when serializing or deserializing JSON), you can use {spring-framework-docs}/core.html#aot-hints-register-reflection-for-binding[`@RegisterReflectionForBinding`] on any bean.
+Most of the hints are automatically inferred, for example when accepting or returning data from a `@RestController` method.
+But when you work with `WebClient` or `RestTemplate` directly, you might need to use `RegisterReflectionForBinding`.
 
 [[native-image.advanced.custom-hints.testing]]
 ==== Testing custom hints