Link to upstream types in docs/EntityManagerDbusAPI.md broken

[bjwyman]

It was: https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/xyz/openbmc_project/Inventory/Item

Things changed.

Not sure if it should point to: https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/gen/xyz/openbmc_project/Inventory/Item -OR- https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/yaml/xyz/openbmc_project/Inventory/Item

[bjwyman]

This doc: https://github.com/openbmc/entity-manager/blob/master/docs/EntityManagerDbusAPI.md

[edtanous]

It should point to the second one (the yaml file). Feel free to submit the patch to fixup the link and I will approve.