Integrate Accelerator API to intermediate_source/dist_tuto.rst

[jafraustro]

Motivation

• Enhance distributed tutorial: integrate Accelerator API for backend selection and add XCCL backend details

Description

• Integrate the Accelerator API into the intermediate_source/dist_tuto.rst to support multiple accelerators and improve backend initialization.

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 @wconstab @osalpekar @H-Huang @kwen2501

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3529

• 📄 Preview Python docs built from this PR

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

⏳ No Failures, 1 Pending

As of commit dbbc95e with merge base 9c2a473 ():
💚 Looks good so far! There are no failures yet. 💚

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[AlannaBurke]

https://docs-preview.pytorch.org/pytorch/tutorials/3529/intermediate/dist_tuto.html

Looks good to me. Make sure someone reviews the content for accuracy.

[sekyondaMeta]

@jafraustro looks like you have some lint errors, can you take a look at them?

[sekyondaMeta]

@H-Huang @kwen2501 Hey guys mind taking a look at this for accuracy? Or know who might be best to take a look?