Update cloudflared.md

[DiskCrasher]

Changed DoH IP addresses to DNS lookups and added new information.

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What does this PR aim to accomplish?:

Main change was replacing IP addresses with DNS endpoints.

How does this PR accomplish the above?:

Updated documentation to reflect.

Link documentation PRs if any are needed to support this PR:

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[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[DiskCrasher]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

Maybe because you waited four months before you considered merging it? What's the point?

[yubiuser]

Sorry for the delay. We are a small team of volunteers doing Pi-hole in our free time next to family, full-time work and other duties. Additionally, we are right in the middle of releasing the next major version.

I only have a small request on your PR.

[github-actions]

Conflicts have been resolved.