README: Correcting doc about SSL_VERIFY_CLIENT
README: Correcting doc about SSL_VERIFY_CLIENT

Based on the documentation I found for ngnix here:
http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_verify_client
evenh/docker-gitlab,evenh/docker-gitlab,solidnerd/docker-gitlab,3kami3/docker-gitlab,sameersbn/docker-gitlab,sameersbn/docker-gitlab,3kami3/docker-gitlab,solidnerd/docker-gitlab