Added some changes to openstack.md file

[prankul88]

#6971

[k8s-ci-robot]

Hi @prankul88. Thanks for your PR.

I'm waiting for a kubernetes 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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[rifelpet]

Thanks for the contribution! This goes well with #6983
/ok-to-test

[rifelpet]

/area documentation

[zetaab]

/lgtm

[adisky]

/lgtm

[justinsb]

Thanks @prankul88

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, prankul88

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