Add log message about if changes are being applied now or later (#12691)

* Add log message about if changes are being applied now or later

* Improve english

* Further adventure in english

builtin/providers/aws/resource_aws_db_instance.go

@@ -839,6 +839,10 @@ func resourceAwsDbInstanceUpdate(d *schema.ResourceData, meta interface{}) error
 	}
 	d.SetPartial("apply_immediately")
 
+	if !d.Get("apply_immediately").(bool) {
+		log.Println("[INFO] Only settings updating, instance changes will be applied in next maintenance window")
+	}
+
 	requestUpdate := false
 	if d.HasChange("allocated_storage") || d.HasChange("iops") {
 		d.SetPartial("allocated_storage")