fix typo in a parameter of the v1beta1 example

[theofpa]

Changes

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[linux-foundation-easycla]

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• ✅ Theofilos Papapanagiotou (c1914e9)

[tekton-robot]

Hi @theofpa. Thanks for your PR.

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[dibyom]

/ok-to-test

[ghost]

/kind documentation
/lgtm

[tekton-robot]

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