chore(ci): update pr template

[spencer-tb]

🗒️ Description

Updates our PR template. Only added some small tweaks. Will leave open for discussion.

Edit: updates added from @danceratopz. Can discuss more in tmo's meeting for final edits.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx --with=tox-uv tox -e lint,typecheck,spellcheck,markdownlint

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

[danceratopz]

Thanks for this! Couple of suggestions below!

[marioevz]

LGTM, thanks for taking care of this! :)

[spencer-tb]

Will keep open until tmo's meeting incase anyone wants to add/remove anything else. :)

[danceratopz]

I realised that the new links in comments make little sense (they won't render). Please find an updated suggestion below; here's how it looks: