Fix OpenAPI description

[dibyom]

s/Pipeline/Triggers

Changes

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As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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[dibyom]

/kind bug

[khrm]

/test pull-tekton-triggers-build-tests

[khrm]

I think you need to run the hack scripts to regenerate.

[tekton-robot]

@dibyom: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-triggers-build-tests	dee6649	link	true	/test pull-tekton-triggers-build-tests

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