Code fix in doc

[akhanin-dnsf]

In this page: https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509chain?view=net-8.0

This line:
if (ch.ChainStatus.Length > 1)

Should be:
if (ch.ChainStatus.Length >= 1)

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-security, @vcsjones