creating-a-cluster.md document should correctly mention ROSA HCP (not just ROSA)

[mzazrivec]

/kind bug

What steps did you take and what happened:
creating-a-cluster.md document in the repo docs mentions the ROSA product. Correctly, it should use ROSA HCP or ROSA Hypershift. This is to be able to distinguish between the hosted control plane ROSA and the classic ROSA setup.

What did you expect to happen:
The doc should use ROSA-HCP instead of just ROSA.

Anything else you would like to add:
Not really.

Environment:
N/A

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[k8s-ci-robot]

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