libusb20: Add dev_open + be_device_foreach manuals

Manual pages for libusb20_open(3) and libusb20_be_device_foreach(3).

PR: 291675
MFC after: 3 days
Reviewed by: adrian (usb), ziaee (manpages)

libusb20: Add dev_open + be_device_foreach manuals

Manual pages for libusb20_open(3) and libusb20_be_device_foreach(3).

PR: 291675
MFC after: 3 days
Reviewed by: adrian (usb), ziaee (manpages)
Differential Revision: https://reviews.freebsd.org/D54231

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