Clarify control plane node description in cluster introduction

[Debasish-87]

Fixes #56507

What this PR does

• Clarifies that the production recommendation refers to control plane nodes.
• Makes it explicit that control plane nodes are also nodes in the Kubernetes cluster.
• Improves the wording to reduce confusion in the cluster introduction tutorial.

[kubernetes-prow]

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[lmktfy]

Thanks for the PR. Superficially it looks consistent, but there's a problem. People reading this may get an idea about Kubernetes and its control plane that is unhelpfully misleading.

It's a subtle detail but that perhaps makes it all the more important not to teach it wrongly.

[Debasish-87]

Thanks for the detailed explanation. I understand the concern now. I based my change on the wording suggested in the linked issue, but I agree that it shouldn't imply control plane nodes are required for all Kubernetes clusters. I'll revise the PR to keep the tutorial accurate while still addressing the original confusion.

[Debasish-87]

Thanks again for the feedback. I've updated the wording to avoid implying that control plane nodes are required and simplified the paragraph to describe a common supported deployment model. Please let me know if you'd like me to adjust the wording further.