Configure bootJar task to add documentation to Spring Boot fat jar

Closes gh-521

docs/src/docs/asciidoc/getting-started.adoc

@@ -245,7 +245,7 @@ from where it will be included in the jar file.
 [source,indent=0,role="secondary"]
 .Gradle
 ----
-	jar {
+	bootJar {
 		dependsOn asciidoctor <1>
 		from ("${asciidoctor.outputDir}/html5") { <2>
 			into 'static/docs'

samples/junit5/build.gradle

@@ -58,7 +58,7 @@ asciidoctor {
 	dependsOn test
 }
 
-jar {
+bootJar {
 	dependsOn asciidoctor
 	from ("${asciidoctor.outputDir}/html5") {
 		into 'static/docs'

samples/rest-assured/build.gradle

@@ -50,7 +50,7 @@ asciidoctor {
 	dependsOn test
 }
 
-jar {
+bootJar {
 	dependsOn asciidoctor
 	from ("${asciidoctor.outputDir}/html5") {
 		into 'static/docs'

samples/rest-notes-spring-hateoas/build.gradle

@@ -56,7 +56,7 @@ asciidoctor {
 	dependsOn test
 }
 
-jar {
+bootJar {
 	dependsOn asciidoctor
 	from ("${asciidoctor.outputDir}/html5") {
 		into 'static/docs'

samples/testng/build.gradle

@@ -55,7 +55,7 @@ asciidoctor {
 	dependsOn test
 }
 
-jar {
+bootJar {
 	dependsOn asciidoctor
 	from ("${asciidoctor.outputDir}/html5") {
 		into 'static/docs'