Replace `-m torch.distributed.run` by `torchrun`

[regisss]

What does this PR do?

This PR replaces occurrences of -m torch.distributed.launch (deprecated) and -m torch.distributed.run (equivalent) by torchrun. More information here.

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• [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [ ] Did you write any new necessary tests?

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[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[ArthurZucker]

Just for reference, is there a reason why the previous occurence is deprecated? (not familiar with it!)

[regisss]

torchrun is equivalent to python -m torch.distributed.run while python -m torch.distributed.launch is deprecated. I think the reason why it is deprecated is just that torchrun does the same but also provides more functionalities.

I improved the description of this PR accordingly.

[regisss]

However torchrun has only been available since the release of torch 1.10. I guess we want to keep compatibility with some previous versions of torch right? @sgugger @ArthurZucker

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