Correct incorrect reference information in chapter_introduction/index.md
Correct incorrect reference information in chapter_introduction/index.md

mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh