添加缺失的注释

src/main/java/com/genersoft/iot/vmp/vmanager/gb28181/device/DeviceControl.java

@@ -313,6 +313,7 @@ public class DeviceControl {
 	@Parameter(name = "deviceId", description = "设备国标编号", required = true)
 	@Parameter(name = "channelId", description = "通道国标编号", required = true)
 	@Parameter(name = "length", description = "播放窗口长度像素值", required = true)
+	@Parameter(name = "width", description = "播放窗口宽度像素值", required = true)
 	@Parameter(name = "midpointx", description = "拉框中心的横轴坐标像素值", required = true)
 	@Parameter(name = "midpointy", description = "拉框中心的纵轴坐标像素值", required = true)
 	@Parameter(name = "lengthx", description = "拉框长度像素值", required = true)