Fixing some wording

[matzew]

Signed-off-by: Matthias Wessendorf mwessend@redhat.com

On eventing-kafka, some lint, reported:

 reviewdog: This is Pull-Request from forked repository.
  reviewdog: found at least one result in diff
  GitHub token doesn't have write permission of Check API, so reviewdog will
  report results via logging command [1].
  [1]: https://help.github.com/en/actions/automating-your-workflow-with-github-actions/development-tools-for-github-actions#logging-commands
  reviewdog: Reporting results for "woke"
  Error: [woke] reported by reviewdog 🐶
  Error:  `dummy` may be insensitive, use `placeholder`, `sample` instead
  
  Raw Output:
  Error: knative.dev/eventing/test/test_images/performance/mako.config:5:25: [error] `dummy` may be insensitive, use `placeholder`, `sample` instead
  Error: Process completed with exit code 1.

[knative-prow-robot]

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This pull-request has been approved by: matzew

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[travis-minke-sap]

/lgtm

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[devguyio]

/lgtm

[codecov]

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