add info about available config.inc.php flags

Signed-off-by: Michael Kaufmann <[email protected]>

admin-guide/settings/index.md

@@ -56,3 +56,10 @@ To overwrite the options in this file, rename/copy it and adjust as needed:
 cd /var/www/html/froxlor
 cp lib/config.example.inc.php lib/config.inc.php
 ```
+
+### Available configuration flags
+
+| Flag                           | Description                                                                                                                                                                                                                                                                                                                                              | Default value |
+|--------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|
+| `enable_webupdate`             | enable/disable the possibility to update froxlor from within the web-interface, recommended value for debian/ubuntu package users is false to rely on apt and not have version mixup. This is also useful for providers that manage the servers but give admin access to froxlor to handle updates the way the providers does it (e.g. automation, etc.) | false         |
+| `disable_otp_security_check`   | settings that have a major impact on the system or which values are used to be executed with high privileges on the system require the admin-user to have set up and enabled OTP for the corresponding account to change these values. To disable this extra security validation, set the value of this to true.                                         | false         |