printing: no billing anymore

printing/index.markdown

@@ -15,7 +15,6 @@ The D-PHYS uses the [ETH Print Service](https://unlimited.ethz.ch/display/itkb/P
   * push- and pull-printing for comfort and privacy
   * centralized technical support
   * automatic delivery of new toner
-  * detailed accounting of the printer usage and per-page billing
   * no additional expenses for the printer hardware, toner or paper
   * efficient printing with fewer, but better adapted printers