Fix typo in README

[clee2000]

Description

Fix typo in readme

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

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3307

• 📄 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, 1 Pending

As of commit c2b8b9d with merge base 9b8204b ():

NEW FAILURE - The following job has failed:

• Check spelling / pyspelling (gh)
  Process completed with exit code 1.

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