Update spark example README.md

[skrawcz]

To explain all examples

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How I tested this

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Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to 56ec333 in 23 seconds

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1. examples/spark/README.md:8

• Draft comment:
  Please confirm that the world_of_warcraft and tpc-h examples exist in the repository. If they do not exist, this reference could mislead users. If they are missing, consider removing or replacing these references.
• Reason this comment was not posted:
  Confidence of 0% on close inspection, compared to threshold of 50%.

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