update result style documentation (openapi-processor/openapi-processor-base#253)

Author: hauner

docs/modules/ROOT/pages/mapping/result-style.adoc

@@ -8,14 +8,22 @@ The `result-style` configuration controls how the processor handles the return t
 map:
   #result-style: success  # use the success result type, this is the default
   result-style: all # use an Object return type
+
+  # result-style is available at endpoint & http method level.
+  /foo:
+    #result-style: success
+
+    get:
+      result-style: success
 ----
 
 * **result-style** (optional).
 
-** `success` (default since 2021.5): generates endpoint methods with the success response type even if it has error responses. This assumes that errors are reported by exceptions.
+** `success` ([.badge .badge-since]+default since 2021.5+): generates endpoint methods with the success response type even if it has error responses. This assumes that errors are reported by exceptions.
 
 ** `all` (default before 2021.5): generates endpoint methods with an `Object` return type if it has error responses.
 
+** [.badge .badge-since]+since 2025.2+ `result-style` is available at the endpoint & http method level.
 
 
 See xref:processor/endpoint-content.adoc[endpoint content types] for a more detailed description.