Polish "Add Kotlin samples for tracing"

See gh-46699

Author: snicoll

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/actuator/micrometertracing/baggage/CreatingBaggage.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * 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.
@@ -27,4 +27,5 @@ class CreatingBaggage(private val tracer: Tracer) {
 			// Business logic
 		}
 	}
-}
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/actuator/micrometertracing/creatingspans/CustomObservation.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * 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.
@@ -30,4 +30,5 @@ class CustomObservation(private val observationRegistry: ObservationRegistry) {
 				// Business logic ...
 			}
 	}
-}
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/actuator/micrometertracing/gettingstarted/MyApplication.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * 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.
@@ -29,14 +29,14 @@ class MyApplication {
 
 	private val logger: Log = LogFactory.getLog(MyApplication::class.java)
 
-
 	@RequestMapping("/")
 	fun hello(): String {
 		logger.info("home() has been called")
 		return "Hello, World!"
 	}
+
 }
 
 fun main(args: Array<String>) {
 	runApplication<MyApplication>(*args)
-}
+}