docs(eks): fix heading levels for Auto Mode

[mazyu36]

The heading levels for Auto Mode are inappropriate.
I think the Auto Mode sections would be better placed under Provision Clusters to align with other node types.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[azharu]

There are redundant headers ("Using Auto Mode" and "Node Pools" appear twice)
Good explanation of the difference between aws-eks and aws-eks-v2 , Links to official documentation are valuable

[mazyu36]

I understand that it’s under the EKS Auto Mode section, but I think it’s okay to keep the header since it helps clarify the structure. I’ve decided to leave it as-is for now out of respect for the original.
I’d like to wait and hear the maintainer’s opinion.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b21f857
• Result: SUCCEEDED
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[ozelalisen]

LGTM

Pull request has been modified.

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[mergify]

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