I'm not able to send you any of my stuff as examples (proprietary materials owned by the company I work for), but here is a list of some of the kinds of things that will go into product documentation, depending on the product of course:
** Functional Specification Document
** Theory of Operation Document
** Schematic, Bill of Materials, PCB Layout documentation
** CPLD/FPGA design documentation (source code, pin definition file, programming file, programming instructions document)
** Documentation of any custom or unique parts used in the design (like transformers, etc.)
let's see, what else?