Update pull_request_template.md

[HarHarLinks]

Description

🎩 Website & Content WG

✔️ Checklist

• Keep this checklist
• Check for common mistakes:
  • Wrap plain URLs in <> to linkify them (learn more).
  • Use the right level of headings: The page title will use a level 1 headings, so your headings should use level 2 and below.
  • Use internal links: when linking to another page on https://matrix.org, use the Zola [label](@/target.md) syntax.
• For blog posts:
  • Verify the date and post ordering on the /blog page, especially for multiple posts on the same day. Prefer UTC format, e.g. 2025-12-01T14:00:00Z for Dec 1st, 2025, 2pm UTC.
  • Set the correct author and category. Browse existing ones at https://matrix.org/author/ and https://matrix.org/category/ to match them.
• If you hold a specific role in relation to the content you are contributing, such as project maintainer or on behalf of a team or organisation, please let us know. See example.
• Let us know if your PR is time-sensitive in any way.
• Mention any issues related to the PR. Use GitHub keywords as appropriate.
• Your individual commits or pull request is signed off.

[cloudflare-workers-and-pages]

Deploying matrix-website with    Cloudflare Pages

Latest commit:	ed602c8
Status:	✅  Deploy successful!
Preview URL:	https://7193060c.matrix-website.pages.dev
Branch Preview URL:	https://harharlinks-update-pr-templa-eyfu.matrix-website.pages.dev

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[HarHarLinks]

I kind of want to add an item to remind maintainers to assign labels, but I also don't want to clutter this list for contributors. 🤔