Fixup typo add required newline

[agcom]

Description

The code block following the added newline is not rendering in the GitHub preview nor the tutorials website at here. Adding the newline would make it render/showup in the GitHub preview and probably (not tested) in the tutorials website.

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/3639

• 📄 Preview Python docs built from this PR

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

✅ No Failures

As of commit bce11d9 with merge base 9803332 ():
💚 Looks good so far! There are no failures yet. 💚

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[svekars]

Thanks!