Polish Gradle plugin's documentation

spring-boot-tools/spring-boot-gradle-plugin/pom.xml

@@ -175,7 +175,11 @@
 									<target>
 										<zip destfile="${project.build.directory}/${project.artifactId}-${project.version}-docs.zip">
 											<zipfileset src="build/libs/${project.artifactId}-${project.version}-javadoc.jar" prefix="api" />
-											<zipfileset dir="${project.build.directory}/generated-docs" prefix="reference" />
+											<zipfileset dir="${project.build.directory}/generated-docs" includes="index.html" prefix="reference/html" />
+											<mappedresources>
+												<fileset dir="${project.build.directory}/generated-docs" includes="index.pdf" />
+												<globmapper from="index.pdf" to="reference/pdf/spring-boot-gradle-plugin-reference.pdf"/>
+											</mappedresources>
 										</zip>
 									</target>
 								</configuration>
@@ -209,6 +213,7 @@
 							</execution>
 						</executions>
 						<configuration>
+							<sourceDocumentName>index.adoc</sourceDocumentName>
 							<attributes>
 								<version-type>${version-type}</version-type>
 								<version>${project.version}</version>

spring-boot-tools/spring-boot-gradle-plugin/src/main/asciidoc/index.adoc

@@ -19,7 +19,7 @@ Andy Wilkinson
 :maven-publish-plugin: {gradle-userguide}/maven_publish_plugin.html
 :software-component: {gradle-userguide}/software_model_extend.html
 :kotlin-plugin: https://kotlinlang.org/docs/reference/using-gradle.html
-:spring-boot-docs: https://docs.spring.io/spring-boot/{version}
+:spring-boot-docs: https://docs.spring.io/spring-boot/docs/{version}
 :api-documentation: {spring-boot-docs}/gradle-plugin/api
 :spring-boot-reference: {spring-boot-docs}/reference/htmlsingle
 :build-info-javadoc: {api-documentation}/org/springframework/boot/gradle/tasks/buildinfo/BuildInfo.html