Use Javadoc attributes for Gradle reference guide

See gh-44388

Signed-off-by: Tran Ngoc Nhan <[email protected]>

Author: ngocnhan-tran1996

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/antora/modules/gradle-plugin/pages/packaging.adoc

@@ -9,7 +9,7 @@ The plugin can create executable archives (jar files and war files) that contain
 == Packaging Executable Jars
 
 Executable jars can be built using the `bootJar` task.
-The task is automatically created when the `java` plugin is applied and is an instance of xref:api/java/org/springframework/boot/gradle/tasks/bundling/BootJar.html[`BootJar`].
+The task is automatically created when the `java` plugin is applied and is an instance of {apiref-gradle-plugin-boot-jar}[`BootJar`].
 The `assemble` task is automatically configured to depend upon the `bootJar` task so running `assemble` (or `build`) will also run the `bootJar` task.
 
 
@@ -101,7 +101,7 @@ See https://github.com/spring-projects/spring-boot/issues/33238[#33238] for deta
 [[packaging-executable.configuring]]
 == Configuring Executable Archive Packaging
 
-The xref:api/java/org/springframework/boot/gradle/tasks/bundling/BootJar.html[`BootJar`] and {apiref-gradle-plugin-boot-war}[`BootWar`] tasks are subclasses of Gradle's `Jar` and `War` tasks respectively.
+The {apiref-gradle-plugin-boot-jar}[`BootJar`] and {apiref-gradle-plugin-boot-war}[`BootWar`] tasks are subclasses of Gradle's `Jar` and `War` tasks respectively.
 As a result, all of the standard configuration options that are available when packaging a jar or war are also available when packaging an executable jar or war.
 A number of configuration options that are specific to executable jars and wars are also provided.
 

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/antora/modules/gradle-plugin/pages/running.adoc

@@ -8,7 +8,7 @@ To run your application without first building an archive use the `bootRun` task
 $ ./gradlew bootRun
 ----
 
-The `bootRun` task is an instance of xref:api/java/org/springframework/boot/gradle/tasks/run/BootRun.html[`BootRun`] which is a `JavaExec` subclass.
+The `bootRun` task is an instance of {apiref-gradle-plugin-boot-run}[`BootRun`] which is a `JavaExec` subclass.
 As such, all of the {url-gradle-dsl}/org.gradle.api.tasks.JavaExec.html[usual configuration options] for executing a Java process in Gradle are available to you.
 The task is automatically configured to use the runtime classpath of the main source set.