Update ddp_series_theory.rst

[sekyondaMeta]

Adding the correct link for the author account

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 @brycebortree @AlannaBurke

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3160

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• GLIBC not found in Nova workflows

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As of commit 13d3a17 with merge base 61307fd ():
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