Polish "Add StatsD transport protocol configuration option"

See gh-22125

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/statsd/StatsdProperties.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/statsd/StatsdPropertiesTests.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.

spring-boot-project/spring-boot-docs/src/docs/asciidoc/production-ready-features.adoc

@@ -1764,7 +1764,7 @@ You can also change the interval at which metrics are sent to Stackdriver:
 ==== StatsD
 The StatsD registry pushes metrics over UDP to a StatsD agent eagerly.
 By default, metrics are exported to a {micrometer-registry-docs}/statsd[StatsD] agent running on your local machine.
-The StatsD agent host,port, and protocol to use can be provided using:
+The StatsD agent host, port, and protocol to use can be provided using:
 
 [source,properties,indent=0,configprops]
 ----