Link to Gradle plugin docs rather than duplicating build info example

Closes gh-11933

spring-boot-project/spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -2522,18 +2522,9 @@ The following example does the same with Gradle:
 	}
 ----
 
-Additional properties can be added by using the DSL, as shown in the following example:
-
-[source,groovy,indent=0,subs="verbatim,attributes"]
-----
-	springBoot  {
-		buildInfo {
-			additionalProperties = [
-				'acme': 'test'
-			]
-		}
-	}
-----
+TIP: See the
+{spring-boot-gradle-plugin-reference}/#integrating-with-actuator-build-info[Spring Boot
+Gradle Plugin documentation] for more details.
 
 
 

spring-boot-project/spring-boot-docs/src/main/asciidoc/index.adoc

@@ -38,6 +38,7 @@ Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson;
 :spring-boot-actuator-api: https://docs.spring.io/spring-boot/docs/{spring-boot-docs-version}/actuator-api/
 :spring-boot-maven-plugin-site: https://docs.spring.io/spring-boot/docs/{spring-boot-docs-version}/maven-plugin
 :spring-boot-gradle-plugin: https://docs.spring.io/spring-boot/docs/{spring-boot-docs-version}/gradle-plugin
+:spring-boot-gradle-plugin-reference: https://docs.spring.io/spring-boot/docs/{spring-boot-docs-version}/gradle-plugin/reference/html
 :spring-reference: https://docs.spring.io/spring/docs/{spring-docs-version}/spring-framework-reference/
 :spring-rest-docs: https://projects.spring.io/spring-restdocs/
 :spring-integration: https://projects.spring.io/spring-integration/