docs: fix link to colossalai

[Borda]

What does this PR do?

after removal in #19248

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cc @Borda @tchaton

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Docs

Check ID	Status
docs-make (pytorch, doctest)	success	✅
docs-make (pytorch, html)	success	✅

These checks are required after the changes to docs/source-pytorch/upgrade/sections/1_9_advanced.rst.

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Thank you for your contribution! 💜

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