Polish "Fix issues with Kotlin examples in Antora docs"

See gh-46064

Author: snicoll

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/devservices/testcontainers/atdevelopmenttime/launch/TestMyApplication.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.features.devservices.testcontainers.atdevelopmenttime.launch
+
+import org.springframework.boot.fromApplication
+
+fun main(args: Array<String>) {
+	fromApplication<MyApplication>().run(*args)
+}
+

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/packaging/nativeimage/advanced/nestedconfigurationproperties/nested/Nested.kt renamed to spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/packaging/nativeimage/advanced/nestedconfigurationproperties/Nested.kt

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.docs.packaging.nativeimage.advanced.nestedconfigurationproperties.nested
+package org.springframework.boot.docs.packaging.nativeimage.advanced.nestedconfigurationproperties
 
 class Nested {
+
+	var number: Int = 0
 }