Update node clients content [Fixes #13199]

[m4sterbunny]

Fixes #13199
Replaces #13200

1. The validator client may be run as a separate client even though it is generally bundled with CL. This clarifies and better aligns the text with the final table ## Components of a node comparison {#node-comparison}.
2. The image implies that EL and CL may "drive" each other. This is not the case, CL can "drive" EL via the Engine API (Besu docs recently updated to improve clarity over this). EL "replies" to CL via Engine API, passively.
3. Light proofs

Related Issue

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	a834ed3
🔍 Latest deploy log	https://app.netlify.com/sites/ethereumorg/deploys/67330bb90c008900088b2127
😎 Deploy Preview	https://deploy-preview-13239--ethereumorg.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 47 (🔴 down 7 from production) Accessibility: 92 (no change from production) Best Practices: 89 (🔴 down 9 from production) SEO: 99 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[m4sterbunny]

@wackerow AFAIK all the review items are addressed now, WDYT?

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[m4sterbunny]

Are we good to go @wackerow ??

[gitpoap-bot]

Congrats, your important contribution to this open-source project has earned you a GitPOAP!

GitPOAP: 2025 Ethereum.org Contributor:

Join the [ethereum.org Discord server](https://ethereum.org/discord) to explore more ways to contribute to the project. Depending on the tasks you complete, you may also unlock additional rewards. Visit [ethereum.org/contributing](https://ethereum.org/contributing) to learn more.

Head to gitpoap.io & connect your GitHub account to mint!Keep buidling, keep learning, and let's grow the Ethereum open-source community together 🌱

Learn more about GitPOAPs here.