[SSL] document Enterprise opt-out process for backup certificates

[ngayerie]

Adds an ## Opt out section to the backup certificates page explaining that Enterprise customers need to contact Cloudflare Support to disable backup certificates.

DEE-3827

[cloudflare-docs-bot]

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

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/src/content/docs/ssl/	@baubuchon-cf, @lgarofalo, @cloudflare/appsec-reviewers, @cloudflare/product-owners

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Preview URL: https://508ebd4d.preview.developers.cloudflare.com
Preview Branch URL: https://dee-3827-backup-cert-opt-out.preview.developers.cloudflare.com

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Original Link	Updated Link
https://developers.cloudflare.com/ssl/edge-certificates/backup-certificates/	https://dee-3827-backup-cert-opt-out.preview.developers.cloudflare.com/ssl/edge-certificates/backup-certificates/

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[baubuchon-cf]

This addition makes sense. I do think we should tighten the wording a bit. “Contact Cloudflare Support” feels broader than what we probably mean here, especially since the linked Support page is generic and says Support cannot make configuration or account changes on a customer’s behalf. If the intended path is to open a support case to request opt-out, I’d suggest saying that directly. For example: “Enterprise customers can request backup certificate opt-out by opening a support case.” We could also add a short note that opting out removes backup-certificate redundancy.

[ngayerie]

[AI] Good point — I've tightened the wording to say "request to opt out by opening a support case" and added a note that opting out removes backup-certificate redundancy. Updated in commit 508ebd4.