Merge branch '2.4.x'

Closes gh-25136

spring-boot-project/spring-boot-docs/src/docs/asciidoc/production-ready-features.adoc

@@ -122,7 +122,7 @@ The following technology-agnostic endpoints are available:
   Disabled by default.
 
 | `startup`
-| Shows the startup steps data collected by the `ApplicationStartup`.
+| Shows the <<spring-boot-features.adoc#boot-features-application-startup-tracking,startup steps data>> collected by the `ApplicationStartup`.
   Requires the `SpringApplication` to be configured with a `BufferingApplicationStartup`.
 
 | `threaddump`

spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc

@@ -426,7 +426,7 @@ Once configured, you can record data by running the application with the Flight
 
 Spring Boot ships with the `BufferingApplicationStartup` variant; this implementation is meant for buffering the startup steps and draining them into an external metrics system.
 Applications can ask for the bean of type `BufferingApplicationStartup` in any component.
-Additionally, Spring Boot Actuator will <<production-ready-features.adoc#production-ready-endpoints, expose a `startup` endpoint to expose this information as a JSON document>>.
+Additionally, Spring Boot Actuator will {spring-boot-actuator-restapi-docs}/#startup[expose a `startup` endpoint to expose this information as a JSON document].
 
 [[boot-features-external-config]]
 == Externalized Configuration