[Docs] Enhance Emotion guidelines

[tkajtoch]

Resolves #8835

Summary

Why are we making this change?

Screenshots

Impact to users

QA

Remove or strikethrough items that do not apply to your PR.

General checklist

• Browser QA
  • Checked in both light and dark modes
  • Checked in both MacOS and Windows high contrast modes
    • (emulate forced colors if you do not have access to a Windows machine.)
  • Checked in mobile
  • Checked in Chrome, Safari, Edge, and Firefox
  • Checked for accessibility including keyboard-only and screenreader modes
• Docs site QA
  • Added documentation
  • Props have proper autodocs (using @default if default values are missing) and playground toggles
  • Checked Code Sandbox works for any docs examples
• Code quality checklist
  • Added or updated jest and cypress tests
  • Updated visual regression tests
• Release checklist
  • A changelog entry exists and is marked appropriately.
  • If applicable, added the breaking change issue label (and filled out the breaking change checklist)
• Designer checklist
  • If applicable, file an issue to update EUI's Figma library with any corresponding UI changes. (This is an internal repo, if you are external to Elastic, ask a maintainer to submit this request)

[tkajtoch]

buildkite test this

[tkajtoch]

buildkite test this

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 2763dbe
• Documentation website
• Storybook

History

• 💔 Build #767 failed 3ee92b7
• 💚 Build #660 succeeded 3ee92b7

cc @tkajtoch

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 2763dbe

History

• 💚 Build #4293 succeeded 3ee92b7

cc @tkajtoch

[github-actions]

👋 Hey there. This PR hasn't had any activity for 90 days. We'll automatically close it if that trend continues for another week. If you feel this issue is still valid and needs attention please let us know with a comment.