Update machineCopnfig documentation for KernelType.

[jbtrystram]

See openshift/machine-config-operator#3903

[openshift-ci]

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API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[sinnykumari]

As per https://github.com/openshift/api#generating-crd-schemas , you would want to update type in https://github.com/openshift/api/blob/master/machineconfiguration/v1/types.go#L324 and run update-codegen-crds . @jkyros can help help better if I missed something.

[jbtrystram]

@sinnykumari thanks for the advice, I went through those steps and updated the PR

[sinnykumari]

/lgtm

[sinnykumari]

For approval
/cc @JoelSpeed @deads2k

[JoelSpeed]

/lgtm

[openshift-ci]

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