Update docs content types for ProblemDetail

Closes gh-36192

framework-docs/modules/ROOT/pages/web/webflux/ann-rest-exceptions.adoc

@@ -32,9 +32,9 @@ any `@RequestMapping` method to render an RFC 9457 response. This is processed a
 - The `status` property of `ProblemDetail` determines the HTTP status.
 - The `instance` property of `ProblemDetail` is set from the current URL path, if not
 already set.
-- For content negotiation, the Jackson `HttpMessageConverter` prefers
-"application/problem+json" over "application/json" when rendering a `ProblemDetail`,
-and also falls back on it if no compatible media type is found.
+- The Jackson JSON and XML message converters use "application/problem+json" or
+"application/problem+xml" respectively as the producible media types for `ProblemDetail`
+to ensure they are favoured for content negotiation.
 
 To enable RFC 9457 responses for Spring WebFlux exceptions and for any
 `ErrorResponseException`, extend `ResponseEntityExceptionHandler` and declare it as an

framework-docs/modules/ROOT/pages/web/webmvc/mvc-ann-rest-exceptions.adoc

@@ -32,9 +32,9 @@ any `@RequestMapping` method to render an RFC 9457 response. This is processed a
 - The `status` property of `ProblemDetail` determines the HTTP status.
 - The `instance` property of `ProblemDetail` is set from the current URL path, if not
 already set.
-- For content negotiation, the Jackson `HttpMessageConverter` prefers
-"application/problem+json" over "application/json" when rendering a `ProblemDetail`,
-and also falls back on it if no compatible media type is found.
+0- The Jackson JSON and XML codecs use "application/problem+json" or
+"application/problem+xml" respectively as the producible media types for `ProblemDetail`
+to ensure they are favoured for content negotiation.
 
 To enable RFC 9457 responses for Spring MVC exceptions and for any
 `ErrorResponseException`, extend `ResponseEntityExceptionHandler` and declare it as an