Mention ForwardedHeaderTransformer in the documentation

Closes gh-37282

Author: mhalbritter

spring-boot-project/spring-boot-docs/src/docs/asciidoc/howto/webserver.adoc

@@ -454,8 +454,8 @@ There are also non-standard headers, like `X-Forwarded-Host`, `X-Forwarded-Port`
 If the proxy adds the commonly used `X-Forwarded-For` and `X-Forwarded-Proto` headers, setting `server.forward-headers-strategy` to `NATIVE` is enough to support those.
 With this option, the Web servers themselves natively support this feature; you can check their specific documentation to learn about specific behavior.
 
-If this is not enough, Spring Framework provides a {spring-framework-docs}/web.html#filters-forwarded-headers[ForwardedHeaderFilter].
-You can register it as a servlet filter in your application by setting `server.forward-headers-strategy` is set to `FRAMEWORK`.
+If this is not enough, Spring Framework provides a {spring-framework-docs}/web.html#filters-forwarded-headers[ForwardedHeaderFilter] for the servlet stack and a {spring-framework-docs}/web-reactive.html#webflux-forwarded-headers[ForwardedHeaderTransformer] for the reactive stack.
+You can use them in your application by setting configprop:server.forward-headers-strategy[] to `FRAMEWORK`.
 
 TIP: If you are using Tomcat and terminating SSL at the proxy, configprop:server.tomcat.redirect-context-root[] should be set to `false`.
 This allows the `X-Forwarded-Proto` header to be honored before any redirects are performed.