[processor/resourcedetection] Add EKS cluster name subsection in README

[aaajhs]

Fixes #34139

[linux-foundation-easycla]

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• ✅ login: aaajhs / name: Danny Jang (73070de)

[songy23]

Please sign the CLA

[aaajhs]

@songy23 Done

[songy23]

LGTM

[ChrsMark]

While adding this example is indeed useful I think the motivation for it surfaces a more generic issue. That has to do with how intuitive and useful is the current format of the attributes' documentation. Users reading the main README.md have to head to the metadata.yaml files to look for more precise "documentation". Not all users might be familiar with this though.
Maybe having an autogenerated .md file listing all the attributes like how it's done in the receivers' docs would be useful?

[codeboten]

While adding this example is indeed useful I think the motivation for it surfaces a more generic issue. That has to do with how intuitive and useful is the current format of the attributes' documentation. Users reading the main README.md have to head to the metadata.yaml files to look for more precise "documentation". Not all users might be familiar with this though. Maybe having an autogenerated .md file listing all the attributes like how it's done in the receivers' docs would be useful?

@ChrsMark I agree, can you open an issue to add this mdatagen?