fix(docs): correct closing bracket in CEL expressions

[l-qing]

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/kind documentation

[tekton-robot]

Hi @l-qing. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[l-qing]

/test check-pr-has-kind-label

[tekton-robot]

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

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[khrm]

/ok-to-test

[khrm]

/test pull-tekton-pipeline-go-coverage-df

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[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Yongxuanzhang

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[chitrangpatel]

/lgtm