📖 Remove extra mention of clusterawsadm in context where it is not needed

[joshrosso]

What this PR does / why we need it:

This removes the second mention of needing to install clusterawsadm for a step where clusterawsadm is not relevant.

It's likely just a copy and paste artifact from the earlier step, when clusterawsadm is required for generating the CloudFormation IAM assets.

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[fabriziopandini]

Thanks, good catch @joshrosso!
/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini, joshrosso

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[sedefsavas]

/lgtm