Fix premul alpha tutorial link

[Starbuck5]

I noticed this on the deployed site, when I went to click on the link.

[coderabbitai]

📝 Walkthrough

Walkthrough

Docstring link updated in a stub file: premul_alpha method’s tutorial URL changed to a new relative path. No code, signature, or behavior changes.

Changes

Cohort / File(s)	Summary of Changes
Docstring link update buildconfig/stubs/pygame/surface.pyi	Updated premul_alpha docstring link from "tutorials/en/premultiplied-alpha" to "../tutorials/en/premultiplied-alpha.html". No signature or logic changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title directly reflects the core change of updating the tutorial link for the premul_alpha method and is both concise and specific.
Description Check	✅ Passed	The description explains that the link was broken on the deployed site and provides the motivation for fixing it, directly relating to the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between abe99c2 and 2ca539f.

📒 Files selected for processing (1)

• buildconfig/stubs/pygame/surface.pyi (1 hunks)

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🔇 Additional comments (1)

buildconfig/stubs/pygame/surface.pyi (1)

1006-1006: Link update looks correct.

The relative path and .html suffix should resolve properly in the generated docs.

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[ankith26]

LGTM 👍