Fix deprecated tutorial links in DDP tutorial

[patrocinio]

Replace deprecated dist_tuto.html links with current recommended resources:

• Link to PyTorch Distributed Overview for process group setup
• Link to official torch.distributed docs instead of old tutorial

Fixes #3526

Description

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

cc @svekars @sekyondaMeta @AlannaBurke @wconstab @osalpekar @H-Huang @kwen2501

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3690

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure

As of commit 2af9cd3 with merge base 7f8b6dc ():

NEW FAILURE - The following job has failed:

• Build tutorials (nightly/test) / build / pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu) (gh)
  RuntimeError: We found a fake tensor in the exported program constant's list. This typically means our tracing system encountered an op that we can't trace through. For the potential source, you can refer to following model attribute: lifted_tensor_1. Please file an issue on github.

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