[SSL] Update certificate-statuses.mdx

[ngayerie]

PCX-11256

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PR Change Summary

Updated the SSL certificate statuses documentation to include new information about the Pending Cleanup status.

• Added a note explaining the Pending Cleanup status for certificates.
• Clarified the process for replacing old certificates with new ones.

Modified Files

• src/content/docs/ssl/reference/certificate-statuses.mdx

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[RebeccaTamachiro]

Thank you, Nic! I think this is worth its own section. Will work on it in PCX-11256.