Upgrade Procedures: ZfD 3.x to ZfD 4.x > Upgrading Workstation Inventory

Reorganized this section and replaced all references of ZfD 3.2 and ZfD 3.2 SP1to ZfD 3.2 SP3 because ZfD 3 or ZfD 3.2 SP1 is not backward compatible with ZfD 4. You must first upgrade all the ZfD 3 or ZfD 3.2 SP1/SP2 Inventory servers to ZfD 3.2 SP3 before upgrading the server to ZfD 4.x.