BAEL-2755 - minor improvements

patterns/design-patterns/src/main/java/com/baeldung/nullobject/NullRouter.java

@@ -4,7 +4,7 @@ public class NullRouter implements Router {
 
     @Override
     public void route(Message msg) {
-        // routing to /dev/null
+        // do nothing
     }
 
 }

patterns/design-patterns/src/main/java/com/baeldung/nullobject/SmsRouter.java

@@ -4,7 +4,7 @@ public class SmsRouter implements Router {
 
     @Override
     public void route(Message msg) {
-        System.out.println("Routing to a SMS gate. Msg: " + msg);
+        System.out.println("Routing to a SMS gateway. Msg: " + msg);
     }
 
 }