ostree-prepare-root: Amend comment about shared mounts

[rborn-tx]

This fixes a comment mentioning a kernel bug which is not really a bug but expected behavior.

[openshift-ci]

Hi @rborn-tx. Thanks for your PR.

I'm waiting for a ostreedev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[jlebon]

Thanks!

[jlebon]

/lgtm
/override ci/prow/fcos-e2e

[openshift-ci]

@jlebon: Overrode contexts on behalf of jlebon: ci/prow/fcos-e2e

In response to this:

/lgtm
/override ci/prow/fcos-e2e

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.