README.md - fix usage comments

[demoth]

Small fix to make usage clearer. Is it a left over? Do you want to have a separate example to run from a different uid?

[linux-foundation-easycla[bot]]

• :white_check_mark:login: demoth / (5425f5914753ef990f94a34b37f6792becccd4f8)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: demoth, thockin

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes/git-sync/blob/master/OWNERS)~~ [thockin] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[thockin]

@demoth to merge this I need you to sign the CLA -- sorry!