Merge pull request #15189 from fdevans/patch-1

Update Spring Boot release notes in upgrading guide

Author: jdaugherty

grails-doc/src/en/guide/upgrading/upgrading60x.adoc

@@ -176,10 +176,10 @@ This update introduces enhancements and fixes to the Spring Framework, providing
 Grails 6 used Spring Boot 2.7.x. Grails {version} updates this to Spring Boot {springBootVersion}. For more information, consult the release notes for previous Spring Boot releases:
 1. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.5-Release-Notes[Spring Boot 3.5 Release Notes]
 2. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes[Spring Boot 3.4 Release Notes]
-3. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes[Spring Boot 3.3 Release Notes]
-4. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes[Spring Boot 3.2 Release Notes]
-5. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes[Spring Boot 3.1 Release Notes]
-6. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.4-Release-Notes[Spring Boot 3.0 Release Notes]
+3. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.3-Release-Notes[Spring Boot 3.3 Release Notes]
+4. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.2-Release-Notes[Spring Boot 3.2 Release Notes]
+5. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.1-Release-Notes[Spring Boot 3.1 Release Notes]
+6. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Release-Notes[Spring Boot 3.0 Release Notes]
 
 ==== 10. Upgrading Your Project:
 
@@ -678,4 +678,4 @@ If your application or API consumers depend on the previous JSON format for `Cal
 
 4. **ZonedDateTime**: Note that the zone ID (e.g., `[America/Los_Angeles]`) is no longer included in the output, matching Spring Boot's behavior.
 
-This change applies to both the `grails-converters` module (standard JSON rendering) and the `grails-views-gson` module (JSON views).
+This change applies to both the `grails-converters` module (standard JSON rendering) and the `grails-views-gson` module (JSON views).