Add some commented lines (as documentation).

FILES/Apache2/cloud-site-name.conf.php-fpm

@@ -23,6 +23,17 @@
 
    ServerName <FULL-QUALIFIED-SITE-NAME>
 
+   # Service Discovery
+   #
+   # !! We alraedy provide this servis via '.htaccess'-file !!
+   #
+   # The redirects for CalDAV or CardDAV does not work if Nextcloud is running behind a
+   # reverse proxy. The recommended solution is that your reverse proxy does the redirects
+   #
+   #RewriteEngine On
+   #RewriteRule ^/\.well-known/carddav https://%{SERVER_NAME}/remote.php/dav/ [R=301,L]
+   #RewriteRule ^/\.well-known/caldav https://%{SERVER_NAME}/remote.php/dav/ [R=301,L]
+
    #ProxyErrorOverride On
 
    <FilesMatch \.php$>