Add a comment regarding User SubDomains in the Docker apache config.

Author: Potherca

site.conf

@@ -1,4 +1,8 @@
 <VirtualHost *:443>
+    # To use User SubDomains, make sure to add a "catch-all", for instance:
+    # ServerName nextcloud.local
+    # ServerAlias *.nextcloud.local
+
     DocumentRoot /var/www/html
     ErrorLog ${APACHE_LOG_DIR}/error.log 
     CustomLog ${APACHE_LOG_DIR}/access.log combined