Polish new layered jar support

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-jar-layered-custom.gradle

@@ -22,7 +22,7 @@ bootJar {
 			}
 			intoLayer("dependencies")
 		}
-		layerOrder "dependencies", "spring-boot-loader", "snapshot-dependencies", "application"
+		layerOrder = ["dependencies", "spring-boot-loader", "snapshot-dependencies", "application"]
 	}
 }
 // end::layered[]

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-jar-layered-custom.gradle.kts

@@ -5,6 +5,10 @@ plugins {
 	id("org.springframework.boot") version "{version}"
 }
 
+tasks.getByName<BootJar>("bootJar") {
+	mainClassName = "com.example.ExampleApplication"
+}
+
 // tag::layered[]
 tasks.getByName<BootJar>("bootJar") {
 	layered {
@@ -18,9 +22,9 @@ tasks.getByName<BootJar>("bootJar") {
 			intoLayer("snapshot-dependencies") {
 				include("*:*:*SNAPSHOT")
 			}
-			intoLayer("dependencies") {
+			intoLayer("dependencies")
 		}
-		layersOrder("dependencies", "spring-boot-loader", "snapshot-dependencies", "application")
+		layerOrder = listOf("dependencies", "spring-boot-loader", "snapshot-dependencies", "application")
 	}
 }
 // end::layered[]

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-jar-layered-exclude-tools.gradle

@@ -9,7 +9,7 @@ bootJar {
 
 // tag::layered[]
 bootJar {
-	layers {
+	layered {
 		includeLayerTools = false
 	}
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/docs/gradle/packaging/boot-jar-layered-exclude-tools.gradle.kts

@@ -11,8 +11,8 @@ tasks.getByName<BootJar>("bootJar") {
 
 // tag::layered[]
 tasks.getByName<BootJar>("bootJar") {
-	layers {
-		includeLayerTools = false
+	layered {
+		isIncludeLayerTools = false
 	}
 }
 // end::layered[]