Update cloudflared.md

[ProgramComputer]

Cloudflare dns over https test(https://www.cloudflare.com/ssl/encrypted-sni/) will show failure for 'Secure Dns' if cloudflared and DNSSEC are enabled. Also issue came up here https://www.reddit.com/r/pihole/comments/fw2w57/pihole_says_insecure_after_setting_up_doh_by/ .

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What does this PR aim to accomplish?: A detailed description, screenshots (if necessary), as well as links to any relevant GitHub issues Cloudflare dns over https test(https://www.cloudflare.com/ssl/encrypted-sni/) will show failure for 'Secure Dns' if cloudflared and DNSSEC are enabled. Also issue came up here https://www.reddit.com/r/pihole/comments/fw2w57/pihole_says_insecure_after_setting_up_doh_by/ .

How does this PR accomplish the above?: A detailed description (such as a changelog) and screenshots (if necessary) of the implemented fix Adds notes on the use of cloudflared

What documentation changes (if any) are needed to support this PR?: A detailed list of any necessary changes This is a documentation change.

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