Update board_config.md

Author: KingRichord

assets/board_config.md

@@ -28,5 +28,5 @@
 # 第三代同步板(V3/MINI)
 固件支持网口和串口配置，配置完成后自动重启。建议采用任意串口工具发送以下指令：
 ```python
-{"f":"cfg","port":8888,"ip":[192,168,1,188],"subnet":[255,255,255,0],"hz_cam_1":20,"hz_cam_2":30,"hz_cam_3":40,"hz_cam_4":50,"uart_0_baud_rate":921600,"uart_1_baud_rate":9600,"uart_2_baud_rate":115200,"use_gps":true,"use_pps":true,"version":300}
+{"f":"cfg","port":8888,"ip":[192,168,1,188],"subnet":[255,255,255,0],"hz_cam_1":10,"uart_0_baud_rate":921600,"uart_1_baud_rate":9600,"uart_2_baud_rate":115200,"use_gps":true,"use_pps":true,"version":300}
 ```