Update example of adding a new node_type

doc/adding_nodes.txt

-
 This file documents the process of adding a new node to the testbed.
 
 A. Information about the node
@@ -35,9 +34,9 @@ B. If the node is of a new type
    Example:
 
    insert into node_types
-   (class,type,proc,speed,RAM,HD,max_cards,max_ports,osid,control_net,imageid,imageable,delay_capacity,control_iface,disktype,delay_osid,pxe_boot_path)
+   (class,type,proc,speed,RAM,HD,max_interfaces,osid,control_net,imageid,imageable,delay_capacity,virtnode_capacity,control_iface,disktype,delay_osid,jail_osid,pxe_boot_path)
    values
-   ("pc","pc2000","P4",2000,512,20.0,5,1,"RHL-STD",0,"UTAHPC-FBSD47+LINUX71",1,2,"eth0","ad","FBSD-STD","boss.emulab.net:/tftpboot/pxeboot");
+   ("pc","pc2000","P4",2000,512,20.0,5,"RHL-STD",0,"emulab-ops-FBSD47+RHL73-STD",1,2,10,"eth0","ad","FBSD-STD","FBSD-STD","boss.emulab.net:/tftpboot/pxeboot");
 
 2. There are several scripts that limit searches to certain classes.
    If the new type you have added does not have class "pc", you may need