Update docs "when" with version info

[NissesSenap]

Changes

Makingakeing it easier to know which version you need as a developer to be
able to use the when condition.

/kind documentation

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Release Notes

[tekton-robot]

Hi @NissesSenap. Thanks for your PR.

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[afrittoli]

Thanks for this!
What about adding a link to the deprecation table instead?

[afrittoli]

Since documents are versioned, I feel like the current wording is ok, but we could include a link to the deprecation table, e.g.

Conditions are [deprecated](./deprecations.md)

[NissesSenap]

Ahh didn't even know that existed.
That will make my life much easier in the future.
I will update the PR after lunch

[afrittoli]

/ok-to-test

[jerop]

/lgtm

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