Documentation for GPU with PCI

[geetikabatra]

This PR adds documentation for GPU PCI implementation.

Signed-off-by: geetikab@vmware.com geetikab@vmware.com

What this PR does / why we need it:

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Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

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[k8s-ci-robot]

Hi @geetikabatra. Thanks for your PR.

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[srm09]

I have added a lot of details to the document around the prerequisites for the cluster creation. Do accept the suggestions as a single commit.

[srm09]

Made some formatting changes, spell checks and reorganization.

[srm09]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[srm09]

/lgtm