Added comment how to add --reservation flag

Author: TetyanaYahodska

tpu/src/main/java/tpu/CreateQueuedResource.java

@@ -81,6 +81,8 @@ public static void createQueuedResource(String projectId, String zone,
                               .setNodeId(nodeName)
                               .build())
                       .build())
+              // You can request a queued resource using a reservation by specifying it in code
+              //.setReservationName("projects/YOUR_PROJECT_ID/locations/YOUR_ZONE/reservations/YOUR_RESERVATION_NAME")
               .build();
 
       CreateQueuedResourceRequest request =