[ACM] Document multi-level subdomain support and limits#30799
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Adds a new section explaining: - No arbitrary limit on subdomain depth - Domain name length limits (253 chars total, 63 chars per label) - Common Name 64-char limit and Cloudflare's SAN workaround - Wildcard coverage (one level only) with examples - 50 hostnames per certificate limit - CA differences (none - all follow same standards) Addresses SPM-3540
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Summary
Documents the limits and capabilities for multi-level subdomains in Advanced Certificate Manager.
Problem
Customers ask about subdomain depth limits when evaluating ACM for deep multi-level subdomains like
1.2.3.4.5.example.com. The current documentation mentions "Cover more than one level of subdomain" but doesn't explain the actual constraints.Solution
Added a new "Multi-level subdomain support" section to the ACM page explaining:
sni.cloudflaressl.comas CN when hostname exceeds 64 charsTicket