[Docs] Remove Example's outer panel border

[tsullivan]

Summary

Closes #10078

Removes an extraneous panel border from the doc site's Example component wrappers.

API Changes

None

Screenshots

Screen recording showing before/after side by side over several fullpage screenshots of the docs site:

eui-docs-example-panel-border-removal-demo-small.mov

Impact Assessment

Note: Most PRs should be tested in Kibana to help gauge their Impact before merging.

• 🔴 Breaking changes — What will break? How many usages in Kibana/Cloud UI are impacted?
• 💅 Visual changes — May impact style overrides; could require visual testing. Explain and estimate impact.
• 🧪 Test impact — May break functional or snapshot tests (e.g., HTML structure, class names, default values).
• 🔧 Hard to integrate — If changes require substantial updates to Kibana, please stage the changes and link them here.

Impact level: 🟢 None

Release Readiness

• Documentation: Fixed a docs issue.
• Figma: N/A
• Migration guide: N/A
• Adoption plan (new features): N/A

QA instructions for reviewer

• Open the docs site locally (e.g., yarn start).
• Navigate to the theming token pages or any page utilizing the Example component wrapper.
• Confirm that the extraneous outer panel border is no longer present around the examples.

Checklist before marking Ready for Review

• Filled out all sections above
• QA: Tested light/dark modes, high contrast, mobile, Chrome/Safari/Edge/Firefox, keyboard-only, screen reader
• QA: Tested in CodeSandbox and Kibana
• QA: Tested docs changes
• Tests: Added/updated Jest, Cypress, and VRT
• Changelog: Added changelog entry
• Breaking changes: Added breaking change label (if applicable)

Reviewer checklist

• Approved Impact Assessment — Acceptable to merge given the consumer impact.
• Approved Release Readiness — Docs, Figma, and migration info are sufficient to ship.

[infra-vault-gh-plugin-prod]

💚 Build Succeeded

• Buildkite Build
• Commit: dffa19a
• Documentation website
• Storybook
• 🚫 Visual regression tests skipped: No VRT-relevant paths changed

[Copilot]

🟢 Approval recommended

The focused change correctly removes the unwanted border without affecting the component API.

0 open findings

What changed in this PR

Removes the extraneous border around documentation examples.

Changes:

• Disables the outer EuiSplitPanel border while retaining inner example framing.

File	Description
packages/​website/​src/​components/​example/​example.tsx	Sets the outer example panel’s hasBorder to false.

🧠 Review effort: Balanced

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[mgadewoll]

🟢 LGTM. Thanks for the cleanup!