Merge branch '3.1.x'

Closes gh-38226

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/features/springapplication/applicationavailability/managing/MyReadinessStateExporter.java

@@ -27,12 +27,12 @@ public class MyReadinessStateExporter {
 	@EventListener
 	public void onStateChange(AvailabilityChangeEvent<ReadinessState> event) {
 		switch (event.getState()) {
-			case ACCEPTING_TRAFFIC:
+			case ACCEPTING_TRAFFIC -> {
 				// create file /tmp/healthy
-				break;
-			case REFUSING_TRAFFIC:
+			}
+			case REFUSING_TRAFFIC -> {
 				// remove file /tmp/healthy
-				break;
+			}
 		}
 	}