feat(java): document minimum supported versions for WebFlux support (#13360)

Author: lcian

docs/platforms/java/guides/spring-boot/webflux.mdx

@@ -5,3 +5,5 @@ description: "Learn more about using Spring WebFlux with Sentry."
 ---
 
 Similar to Spring MVC, Sentry offers support for Spring WebFlux. When developing a reactive web application, Sentry Spring Boot Starter creates the infrastructure required for capturing errors triggered during HTTP request processing.
+
+The minimum version of Spring Boot supported by the Sentry WebFlux integration is `v2.2.5.RELEASE`.

platform-includes/getting-started-primer/java.spring-boot.mdx

@@ -3,6 +3,7 @@
 There are two variants of Sentry available for Spring Boot. If you're using our Gradle plugin it will pick the right dependency for you. If you're manually adding the dependency and using Spring Boot 2, use `sentry-spring-boot-starter` ([GitHub](https://github.com/getsentry/sentry-java/tree/main/sentry-spring-boot-starter)). If you're using Spring Boot 3, use `sentry-spring-boot-starter-jakarta` instead ([GitHub](https://github.com/getsentry/sentry-java/tree/main/sentry-spring-boot-starter-jakarta)).
 
 Sentry's integration with [Spring Boot](https://spring.io/projects/spring-boot) supports Spring Boot 2.1.0 and above to report unhandled exceptions as well as release and registration of beans. If you're on an older version, use [our legacy integration](/platforms/java/legacy/spring/).
+The minimum version of Spring Boot supported by the Sentry WebFlux integration is, instead, 2.2.5.RELEASE.
 
 The `sentry-spring-boot-starter` and `sentry-spring-boot-starter-jakarta` libraries enhance [Sentry Spring](/platforms/java/guides/spring/) to:
 

platform-includes/getting-started-primer/java.spring.mdx

@@ -3,6 +3,7 @@
 There are two variants of Sentry available for Spring. If you're using Spring 5, use `sentry-spring` ([GitHub](https://github.com/getsentry/sentry-java/tree/master/sentry-spring)). If you're using Spring 6, use `sentry-spring-jakarta` instead ([GitHub](https://github.com/getsentry/sentry-java/tree/master/sentry-spring-jakarta)).
 
 Sentry's integration with [Spring](https://spring.io/projects/spring-framework) supports Spring Framework 5.1.2 and above to report unhandled exceptions and optional user information. If you're on an older version, use [our legacy integration](/platforms/java/legacy/spring/).
+The minimum version of Spring Framework supported by the Sentry WebFlux integration is, instead, 5.2.4.
 
 - Provides a [HandlerExceptionResolver](https://docs.spring.io/spring/docs/4.3.9.RELEASE/javadoc-api/org/springframework/web/servlet/HandlerExceptionResolver.html) to send unhandled exceptions to Sentry
 - Attaches HTTP request information to every `SentryEvent` recorded within the scope of the request