HBASE-27899 Beautify the output information of the getStats method in…

… ReplicationSource (#5269)

Signed-off-by: 874645213@qq.com <jiancong123~>
Co-authored-by: 874645213@qq.com <jiancong123~>
Signed-off-by: Duo Zhang <zhangduo@apache.org>

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java

@@ -789,7 +789,7 @@ public String getStats() {
         sb.append("currently replicating from: ").append(currentPath).append(" at position: ")
           .append(position).append("\n");
       } else {
-        sb.append("no replication ongoing, waiting for new log");
+        sb.append("no replication ongoing, waiting for new log").append("\n");
       }
     }
     return sb.toString();