Update Troubleshooting page 'initrd kernel replacement' for Rocks 7

[Aceba1]

https://github.com/rocksclusters/wiki/wiki/initrd-kernel-replacement
I am trying to update the kernel to include various networking drivers, to get a compute node to connect to the frontnode through the kernel roll USB. It would be nice to know if and what specific 'adjustments' in the guide are necessary to achieve this.