💡 [REQUEST][PTD][DDP] Review the DDP Video Tutorials and modify the scripts so it can be run

[wz337]

🚀 Describe the improvement or the new tutorial

📚 The doc issue
Distributed Data Parallel in PyTorch - Video Tutorials - https://pytorch.org/tutorials/beginner/ddp_series_intro.html - ?

The scripts on some of these tutorials are not friendly as it cannot be directly copied pasted to run. We could still show the difference, but we should at least include the copy paste-able version of the running scripts.

Existing tutorials on this topic

No response

Additional context

No response

cc @svekars @brycebortree @wconstab @osalpekar @H-Huang @kwen2501