Improve docs for default site with HTTPS

Provide a working solution of default site configuration for both HTTP and HTTPS requests.

docs/configuration/domains.md

@@ -131,12 +131,20 @@ Create the file at `/etc/nginx/conf.d/00-default-vhost.conf`:
 
 ```nginx
 server {
-  listen 80 default_server;
-  listen [::]:80 default_server;
+    listen 80 default_server;
+    server_name _;
+    access_log off;
+    return 410;
+}
 
-  server_name _;
-  return 410;
-  log_not_found off;
+# For HTTPS requests you can enable this section:
+# (You need a SSL certificate in /etc/nginx/ssl/)
+server {
+#    listen 443 ssl;
+#    server_name _;
+#    ssl_certificate /etc/nginx/ssl/cert.crt;
+#    ssl_certificate_key /etc/nginx/ssl/cert.key;
+#    return 410;
 }
 ```