Update DNS setup

[benniepeter]

`## Maelezo ya Mabadiliko
- [x] Imeboresha maelezo ya DNS setup
- [x] Imerekebisha muundo wa kichwa

 ### Sababu
 Kufanya maelezo yawe wazi zaidi kwa watumiaji.`

Summary

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[hyperlint-ai]

Howdy and thanks for contributing to our repo. The Cloudflare team reviews new, external PRs within two (2) weeks. If it's been two weeks or longer without any movement, please tag the PR Assignees in a comment.

We review internal PRs within 1 week. If it's something urgent or has been sitting without a comment, start a thread in the Developer Docs space internally.

---

PR Change Summary

Updated the DNS setup documentation to enhance clarity and improve structure.

• Improved the DNS setup details for better user understanding
• Revised the title to reflect advanced setup guidance
• Added a description for Cloudflare proxy settings

Modified Files

• src/content/docs/dns/zone-setups/partial-setup/setup.mdx

---

How can I customize these reviews?

Check out the Hyperlint AI Reviewer docs for more information on how to customize the review.

If you just want to ignore it on this PR, you can add the hyperlint-ignore label to the PR. Future changes won't trigger a Hyperlint review.

Note specifically for link checks, we only check the first 30 links in a file and we cache the results for several hours (for instance, if you just added a page, you might experience this). Our recommendation is to add hyperlint-ignore to the PR to ignore the link check for this PR.