[CI] Fix quality check failure due to sorting issue in toctree

[DN6]

What does this PR do?

PR CI quality check is failing
https://github.com/huggingface/diffusers/actions/runs/18674230815/job/53240870881?pr=12517#step:5:28

because of a sorting issue in the toctree. I just ran python utils/check_doc_toc.py --fix-and-overwrite to resolve.

Fixes # (issue)

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[HuggingFaceDocBuilderDev]

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[stevhliu]

Thanks, I think #12522 fixed it