updated nrfutil download link

[dstude]

The link https://www.nordicsemi.com/Products/Development-tools/nRF-Util/Download?lang=en#infotabs doesn't provide direct download URLs (for instance if this should be scripted).

Are there direct download URLs for this?

[dstude]

i found the link that provides `curl` commands here:  docs.nordicsemi.com/.../installing.html