Add argument for --schema-file option in ipa-ldap-updater.1
    
    There are no arguments in the --schema-file option,
    but the Schema file in LDIF format must actually be specified.
    Therefore, add FILE.ldif as an argument
    
    In addition, the --schema option no longer exists, so remove the description.
    
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>