Update eventlisteners.md

[djfinnoy]

I believe these lines contain typos; I had to modify them in my own pipeline to get the cel expressions working.

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Edits to documentation.

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[tekton-robot]

Hi @djfinnoy. Thanks for your PR.

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[dibyom]

/ok-to-test

[dibyom]

Thanks, you are right. We changed the examples but not the examples embedded in the docs.

/lgtm

[dibyom]

I was wrong -- looks like we need to update the examples too. @djfinnoy would you mind updating examples/eventlisteners/cel-eventlistener-no-filter.yaml as well?

[dibyom]

/test pull-tekton-triggers-integration-tests

[dibyom]

/approve
/lgtm

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