Why does 000-default-le-ssl.conf contain only one with 2 subdomains?

Question

linux

I created two virtual hosts/subdomains (fastdl and demo), then created ssl certificates for them.
But why does 000-default-le-ssl.conf contain only one subdomain and the root is specified for only one?

ServerAdmin [email protected]
DocumentRoot /var/www/www-data/www/demo.site.ru

ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined

ServerName demo.site.ru
SSLCertificateFile / /etc/letsencrypt/live/demo.site.ru/privkey.pem Include
/etc/letsencrypt/options-ssl-apache.conf