Docs: Improve GPU documentation

[mliradelc]

Proposed changes

I was installing docker with GPU support and I notice that installing only nvidia-container-runtime doesn't install the runtime hook.

I added nvidia-container-toolkit installation that includes the runtime hook. Also commands for RHEL based systems

Related issues (optional)

None

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[mliradelc]

To the maintainers of this repo, can you please add the label hacktoberfest to the repo or hacktoberfest-accepted as a label to this PR? Thanks

More info on: https://hacktoberfest.com/

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale