fix a typo in optimization_tutorial.py

[partev]

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.

cc @svekars @sekyondaMeta @AlannaBurke

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3333

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[svekars]

Please sign the CLA

[partev]

Please sign the CLA

@svekars I signed it