[R2] Clarifying wording on adding domain as a zone

[Oxyjun]

Summary

Closes PCX-13834

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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.

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PR Change Summary

Clarified wording regarding the requirements for using custom domains with R2 buckets.

• Updated the restriction on custom domains to specify that the domain must be added as a zone in the same account as the R2 bucket.

Modified Files

• src/content/docs/r2/buckets/public-buckets.mdx

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[github-actions]

Preview URL: https://e61dc306.preview.developers.cloudflare.com
Preview Branch URL: https://jun-r2-domain-restriction-update.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/buckets/public-buckets/	https://jun-r2-domain-restriction-update.preview.developers.cloudflare.com/r2/buckets/public-buckets/