Documentation: Missing certifacate options in SimpleClientCertAuth

[celestian]

It could be little confusing that we cannot see notes about how to tell Custodia which certificate we would like to use.

[tiran]

Custodia currently accepts all valid client certificate that are trusted by the CA (global option tls_cafile). There is no additional filtering or support for CRL or OCSP status checks.

IMO we should recommend Apache mod_ssl or other TLS terminates to perform these checks for us.

[simo5]

+1