Add verification step to install instructions

[eero-t]

Please add e.g. dkms status step to install instructions, from which output user can check that kernel module was actually installed before rebooting to the OEM kernel with driver.

In the howto section you can then tell how to correct that (e.g. do dkms autoinstall, correct the issue its log points out, and try again).

[alexzuointel]

thanks for comments. Some install verification instructions have been added . thanks.

[eero-t]

New verification steps are only for whether user space drivers work. I meant verification of whether DKMS package install actually installed the DKMS package. Before that it's pointless to reboot to new kernel.

Few other quick comments for the updated docs...

Arc:

• lspci -v | grep -A8 VGA => lspci -v | grep -A8 -E "(VGA|Display).*Intel" (so it matches only Intel GPUs, and can be used also with data center dGPUs)
• Typo: "GPU.More"

All:

• Reboot after OEM kernel install is redundant, it's enough to reboot to new kernel after all setup is done
• Reboot to DKMS is part of "OPTIONAL: Install developer packages" section. It should be its own step
• User group change should be before reboot, as new group won't be in effect until user-relogins

PS. For user-space driver updates and group addition, another option is just restarting user session (either using sudo systemd restart <dm> or simply logging out and back in again).