Replace RFC 7807 by RFC 9457 in documentation

This commit updates all references to RFC 7807 by RFC 9457 since the
former is now obsolete.

Closes gh-41260

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/WebFluxProperties.java

@@ -145,7 +145,7 @@ public void setDateTime(String dateTime) {
 	public static class Problemdetails {
 
 		/**
-		 * Whether RFC 7807 Problem Details support should be enabled.
+		 * Whether RFC 9457 Problem Details support should be enabled.
 		 */
 		private boolean enabled = false;
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcProperties.java

@@ -450,7 +450,7 @@ public enum MatchingStrategy {
 	public static class Problemdetails {
 
 		/**
-		 * Whether RFC 7807 Problem Details support should be enabled.
+		 * Whether RFC 9457 Problem Details support should be enabled.
 		 */
 		private boolean enabled = false;
 

spring-boot-project/spring-boot-docs/src/docs/asciidoc/web/reactive.adoc

@@ -165,7 +165,7 @@ For machine clients, it produces a JSON response with details of the error, the
 For browser clients, there is a "`whitelabel`" error handler that renders the same data in HTML format.
 You can also provide your own HTML templates to display errors (see the <<web#web.reactive.webflux.error-handling.error-pages,next section>>).
 
-Before customizing error handling in Spring Boot directly, you can leverage the {spring-framework-docs}/web/webflux/ann-rest-exceptions.html[RFC 7807 Problem Details] support in Spring WebFlux.
+Before customizing error handling in Spring Boot directly, you can leverage the {spring-framework-docs}/web/webflux/ann-rest-exceptions.html[RFC 9457 Problem Details] support in Spring WebFlux.
 Spring WebFlux can produce custom error messages with the `application/problem+json` media type, like:
 
 [source,json,indent=0,subs="verbatim"]

spring-boot-project/spring-boot-docs/src/docs/asciidoc/web/servlet.adoc

@@ -339,7 +339,7 @@ TIP: The `BasicErrorController` can be used as a base class for a custom `ErrorC
 This is particularly useful if you want to add a handler for a new content type (the default is to handle `text/html` specifically and provide a fallback for everything else).
 To do so, extend `BasicErrorController`, add a public method with a `@RequestMapping` that has a `produces` attribute, and create a bean of your new type.
 
-As of Spring Framework 6.0, {spring-framework-docs}/web/webmvc/mvc-ann-rest-exceptions.html[RFC 7807 Problem Details] is supported.
+As of Spring Framework 6.0, {spring-framework-docs}/web/webmvc/mvc-ann-rest-exceptions.html[RFC 9457 Problem Details] is supported.
 Spring MVC can produce custom error messages with the `application/problem+json` media type, like:
 
 [source,json,indent=0,subs="verbatim"]