[patch] Expand tls plugin docs concerning certificate chains (1 message)

Perhaps counterintuitively, IO::Socket:SSL expects that multi-step SSL
cert chains must have the intermediate certs in the SSL_cert_file
path and not the SSL_ca_file path. Add documentation on this point,
and a way of verifying cert configuration since most MTAs won't be
at all helpful in diagnosing SSL verification errors.

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