update uss example

documentation/mainDocument/sections/uss_example.c

@@ -18,7 +18,8 @@ int getDistance() {
 	
 	wiringPiI2CWriteReg8(fd, COMMAND_REGISTER, RANGING_MODE_CM);
 	usleep(DELAY * 1000);
-	int distance = wiringPiI2CReadReg16(fd, RESULT_LOW_BYTE);
+	int distance = wiringPiI2CReadReg8(fd, RESULT_LOW_BYTE);
+	distance += wiringPiI2CReadReg8(fd, RESULT_HIGH_BYTE);
 
 	return distance;
 }