fix format in using-iam-roles-in-mgmt-cluster.md

[yogeek]

Fix list : numbers and indentation

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This PR only fixes some formatting on the documentation

[k8s-ci-robot]

@yogeek: This issue is currently awaiting triage.

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[k8s-ci-robot]

Welcome @yogeek!

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[k8s-ci-robot]

Hi @yogeek. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[richardcase]

/ok-to-test

[Ankitasw]

Thanks for doing this @yogeek 🎉
/lgtm

[Ankitasw]

cc @richardcase / @sedefsavas for approval

[richardcase]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: richardcase

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