Merge tag 'efi-2023-07-rc2' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2023-07-rc2

Documentation:

* treat documentation warnings as errors in CI
* adjust StarFive VisionFive 2 and SiFive Unmatched documentation
* man-page for cp
* correct description of uclass_get_device_by_of_path
* correct proftool usage

UEFI

* Fix documentation of EFI Python tests
* Rename efi_selftest Python test