Remove duplicate entry in usage doc

[jcapiitao]

As a pull request owner and reviewers, I checked that:

• Appropriate testing is done and actually running
• Appropriate documentation exists and/or is up-to-date:
  • README in the role
  • Content of the docs/source is reflecting the changes

[github-actions]

Thanks for the PR! ❤️
I am marking it as a draft, once passing your happy and the PR is passing CI click the "Ready for review" button below.

[openshift-ci]

Hi @jcapiitao. Thanks for your PR.

I'm waiting for a openstack-k8s-operators 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.

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[cjeanner]

/ok-to-test
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjeanner

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[cjeanner]

/lgtm