Fix Monarch tutorial links

[GavinWongYF]

Fixes #3811

Description

Fixed two broken links in the Monarch tutorial: intermediate_source/monarch_distributed_tutorial.rst.

On Mar 31, 2026, the Monarch documentation migrated to a multi-version structure (see Monarch PRs #3328, #3333). This removed the root-level /generated/ paths, causing the original links in the tutorial to 404.

I have updated the links to the latest stable version v0.4.0, which I have verified to work now.
I checked for a /stable/ or /latest/ alias, but the upstream repo hasn't implemented these redirects yet; I will communicate with the Monarch maintainers and update accordingly once those aliases become available.

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.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3817

• 📄 Preview Python docs built from this PR

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