[SSL] Clarify USSL for partial zones is not limited to first-level

[RebeccaTamachiro]

Summary

PCX-9894

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PR Change Summary

Clarified that Universal SSL certificates support all levels of subdomains in CNAME setup zones.

• Updated documentation to specify that Universal SSL certificates are available for all subdomain levels, not just first-level subdomains.
• Enhanced the explanation of CNAME setup zones regarding Universal SSL certificate provisioning.

Modified Files

• src/content/docs/ssl/edge-certificates/universal-ssl/limitations.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/ssl/	@RebeccaTamachiro, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://5c0a1ac6.preview.developers.cloudflare.com
Preview Branch URL: https://rebecca-ssl-clarify-ussl-partial-zones.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/ssl/edge-certificates/universal-ssl/limitations/	https://rebecca-ssl-clarify-ussl-partial-zones.preview.developers.cloudflare.com/ssl/edge-certificates/universal-ssl/limitations/