[WIP][4/N] Refine beginner tutorial by accelerator api

[guangyey]

Fixes #ISSUE_NUMBER

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.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3190

• 📄 Preview Python docs built from this PR

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

❌ 3 New Failures

As of commit f6f7038 with merge base 540bd0c ():

NEW FAILURES - The following jobs have failed:

• Build tutorials / pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu) (gh)
  AttributeError: module 'torch' has no attribute 'accelerator'
• Build tutorials / pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu) (gh)
  AttributeError: module 'torch' has no attribute 'accelerator'
• Check spelling / pyspelling (gh)
  Process completed with exit code 1.

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