The data link from orderbook_data example doc is obsolete

[yebob-git]

📖 Documentation

The following data link from the orderbook_data example readme.md doc is obsolete and unaccessible:
gdown https://drive.google.com/uc?id=15nZF7tFT_eKVZAcMFL1qPS4jGyJflH7e

[SunsetWolf]

Hi, @yebob-git
Thanks for your interest in qlib, this issue has been fixed in PR 1990.