5.0 docs: "SslProtocols" and "ClientCertificateMode" settable via config

[JamesNK]

• "SslProtocols" settable via config (Kestrel Endpoints' "SslProtocols" settable via config (#22663) #22910)
• "ClientCertificateMode" settable via config (Load ClientCertificateMode from config #24076)

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