fc-shell help: batt command: better documentation The semantic meaning of the two bytes carried in the MMI_BATTERY_IND primitive depends on the firmware version. Update the documentation to describe what these two bytes mean in current FC Tourmaline firmware.

struct cmdtab {
	char *cmd;
	int minargs;
	int maxargs;
	int (*func)();
};

#define	MAX_CMD_ARGS	16