Fix comments in config to make them consistent with docs and code.

[xneg]

Description

Current config samples contradict the actual code. I was confused what is the right settings and decided to fix samples to make them consistent with docs and code.

Testing done

There are no tests for comment changes.

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")
• Do these changes have compatibility implications for rollback? If so, ensure that the ksql command version is bumped.

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