update cleanup

[toshi0607]

Fixes #issue-number
no issue

Proposed Changes

• channel.yaml was removed and channel.yaml was updated to trigger.yaml in this PR
  Update the kubernetes-event-source example to use Broker, rather than Channel. #1091

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[toshi0607]

@googlebot I signed it!

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[toshi0607]

/assign @RichieEscarez

[carieshmarie]

Thanks for referencing the original PR where this change occurred!

[knative-prow-robot]

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[toshi0607]

/retest

[knative-prow-robot]

@toshi0607: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[samodell]

/ok-to-test

[samodell]

/test pull-knative-docs-integration-tests