[docbook-css] List Counting for Procedure

[martin.gautier@myrnham.co.uk]

I've added procedure to get the list counting to work properly...

Mozilla.css

---orderedlist, itemizedlist {
+++orderedlist, itemizedlist, procedure {
   /* this seems to be required to make auto-numbering work */
   -moz-counter-reset: -html-counter 0;
}