The nRF52840DK is an excellent wireless dev board due to the
integrated debugger, the nRF52840-Dongle is missing the debugger and
therefore a suboptimal choice.
The nRF52840-Dongle is cheap and has an excellent form factor that
allows to easily plug it into e.g. an OpenWRT system to quickly provide
a border router. The nRF52840DK is too large and too expensive for that
use case.
It appears that the rows have just been switched by mistake, this
switches them back to be correct.
This is needed for those who do not know about searching the periph conf
It gives some hints on how to physically locate you board if connecting up sensors
