Polish startup endpoint description in reference doc

Closes gh-26978

Author: snicoll

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

@@ -417,4 +417,5 @@ 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 {spring-boot-actuator-restapi-docs}/#startup[expose a `startup` endpoint to expose this information as a JSON document].
+
+Spring Boot can also be configured to expose a {spring-boot-actuator-restapi-docs}/#startup[`startup` endpoint] that provide this information as a JSON document.