Update the return-types.adocs

Author: verils

framework-docs/modules/ROOT/pages/web/webflux/controller/ann-methods/return-types.adoc

@@ -84,6 +84,15 @@ Reactor provides a dedicated operator for that, `Flux#collectList()`.
   to be written (however, `text/event-stream` must be requested or declared in the mapping
   through the `produces` attribute).
 
+| `Flux<DataBuffer>`
+| Write raw data buffers to the response, for example, when handling file
+  downloads or proxying data.
+
+| `Resource`
+| Return a single resource that is written to the response using `ResourceHttpMessageWriter`.
+
+  Notice, this writer overrides your response's `Content-Type` header, make sure you're intending to do so.
+
 | Other return values
 | If a return value remains unresolved in any other way, it is treated as a model
   attribute, unless it is a simple type as determined by

framework-docs/modules/ROOT/pages/web/webmvc/mvc-controller/ann-methods/return-types.adoc

@@ -95,6 +95,12 @@ supported for all return values.
   collected to a List and rendered as a single value. See xref:web/webmvc/mvc-ann-async.adoc[Asynchronous Requests] and
   xref:web/webmvc/mvc-ann-async.adoc#mvc-ann-async-reactive-types[Reactive Types].
 
+| `Resource`
+| Return a single resource that is written to the response using
+  `ResourceHttpMessageConverter` implementations.
+
+  Notice, this writer overrides your response's `Content-Type` header, make sure you're intending to do so.
+
 | Other return values
 | If a return value remains unresolved in any other way, it is treated as a model
   attribute, unless it is a simple type as determined by