add factory config

Author: KingRichord

assets/doc/board_config.md

@@ -87,7 +87,10 @@ sudo cutecom                 # 启动
 
 由于同步板的配置参数较多，部分用户参数配置错误，导致无法正常工作。因此，需要恢复出厂设置。
 1. 更新重置固件SDK2_FIRMWARE_FACTORY_RESET.uf2。
-在重置固件中默认使用以下配置命令进行的配置："port":8888,"ip":[192,168,1,188],"subnet":[255,255,255,0],"hz_cam_1":1,"hz_cam_2":2,"hz_cam_3":4,"hz_cam_4":8,"hz_imu_2":10,"xtal_diff":0,"uart_0_baud_rate":921600,"uart_1_baud_rate":9600,"uart_2_baud_rate":115200,"use_gps":true,"use_pps":true,"version":400
+在重置固件中默认使用以下配置命令进行的配置：
+```txt
+    "port":8888,"ip":[192,168,1,188],"subnet":[255,255,255,0],"hz_cam_1":1,"hz_cam_2":2,"hz_cam_3":4,"hz_cam_4":8,"hz_imu_2":10,"xtal_diff":0,"uart_0_baud_rate":921600,"uart_1_baud_rate":9600,"uart_2_baud_rate":115200,"use_gps":true,"use_pps":true,"version":400
+```
 2. 重置完成后，重新上电，系统自动加载上述配置。
 3. 正常运行后。可以发送3.2节的指令进行配置。
 4. 默认配置更新后，刷入最新固件即可。