Fix coreos multipath installation

[mburke5678]

https://redhat.atlassian.net/browse/OCPBUGS-112076

Link to docs preview:

QE review:

• QE has approved this change.

[mburke5678]

@alicefr PTAL

[alicefr]

Do you mind a sentence why we need to drop this option starting from OCP 4.22 since the documentation changed. The reason is because coreos installer will handle automatically the setting of root. Now instead of pointing to the root disk by label which might cause some partition collision, we will refer it by uuid, and the coreos installer will automatically add the option root=/dev/disk/by-label/dm-mpath-$UUID

[ocpdocs-previewbot]

🤖 Wed Aug 19 15:26:34 - Prow CI generated the docs preview:

https://118401--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal.html
https://118401--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-bare-metal-network-customizations.html
https://118401--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_bare_metal/upi/installing-restricted-networks-bare-metal.html

[openshift-ci]

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