Fix contributing guide label links

[Mirochill]

Summary

Fix the contributing guide links for the kind/question and area/docs GitHub labels.

The label names contain /, so the label URLs need %2F encoding. The kind/question link is kept inline inside the note shortcode so the generated website can render it correctly.

Fixes #10765.

Validation

• git diff --check HEAD~1..HEAD
• GitHub API metadata checked for kind%2Fquestion and area%2Fdocs
• Remote checks green on af9f0b1: Detect changed files, Status, Tests / FreeBSD Status, pre-commit.ci - pr, and Sourcery review
• Full test matrix skipped as docs-only; Documentation Preview skipped on the follow-up push

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[github-actions]

Deploy preview for website ready!

Project:	website
Status:	✅  Deploy successful!
Preview URL:	https://website-rdkj03fau-python-poetry.vercel.app
Latest Commit:	af9f0b1

Deployed with vercel-action

[radoering]

This does not seem to work. See the generated preview. Maybe, the link targets have to be inline in notes. 🤷 By the way, you can also build the docs locally with the website repo.

[Mirochill]

Thanks, fixed in af9f0b1 by keeping the links inside the note inline and only encoding the label slash in the GitHub URL.

The latest published checks are green: Detect changed files, Status, pre-commit.ci, Sourcery review, and FreeBSD. The Documentation Preview job was skipped on this follow-up push, so I do not have a refreshed preview URL to cite.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.