fix: check styles on publisher-subscriber design pattern (iluwatar#2898)

Author: sanurah

publish-subscribe/src/main/java/com/iluwatar/publish/subscribe/subscriber/CustomerSupportSubscriber.java

@@ -7,7 +7,7 @@
 import org.slf4j.LoggerFactory;
 
 /**
- * This class subscribes to CUSTOMER_SUPPORT topic
+ * This class subscribes to CUSTOMER_SUPPORT topic.
  */
 @Slf4j
 public class CustomerSupportSubscriber implements Subscriber {