Update SDK_advanced_guide_online.md

Yabin Li

2023-08-16 a657238ad362142cb5b56c47c26cf294884693a8

1
2
3
4
5
6
7
8
9
X    1
XX    2
XXX    3
XL    4
L    5
LX    6
LXX    7
LXXX    8
XC    9