generate documentation from config.sample.php

admin_manual/configuration_server/config_sample_php_parameters.rst

@@ -1067,6 +1067,9 @@ Use this configuration parameter to specify the base URL for any URLs which
 are generated within Nextcloud using any kind of command line tools (cron or
 occ). The value should contain the full base URL:
 ``https://www.example.com/nextcloud``
+Please make sure to set the value to the URL that your users mainly use to access this Nextcloud.
+
+Otherwise there might be problems with the URL generation via cron.
 
 Defaults to ``''`` (empty string)