fix broken links to studios

[KaelanDt]

What does this PR do?

Fix some broken links in the parallelism tutorial (due to a removed studio), redirects to a Studio template that is about pre-training in general and contains some discussion of parallelism inside.

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[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 fabric: Docs

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

These checks are required after the changes to docs/source-fabric/advanced/model_parallel/tp_fsdp.rst.

🟢 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/advanced/model_parallel/tp.rst.

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Thank you for your contribution! 💜

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