Fix broken link to Autograd tutorial

[agnuspaul98]

This PR fixes a broken link in the Optimization tutorial that pointed to a non-existent Autograd page.

cc @svekars @sekyondaMeta @AlannaBurke

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3757

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As of commit ce60e72 with merge base 6e608db ():
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[agnuspaul98]

Hi @sekyondaMeta @svekars
Is there any update on this PR?