NO-JIRA: Point users to new location for csi-operator migration guide

[stephenfin]

Depends on openshift/csi-operator#279

[openshift-ci-robot]

@stephenfin: This pull request explicitly references no jira issue.

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Depends on openshift/csi-operator#279

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[stephenfin]

openshift/csi-operator#279 is merged now.

/cc @gnufied