cel langdef doc links

[bitsofinfo]

Changes

Updated docs to include links to the actual CEL language specification as it is not clear from the docs in their current state what the standard CEL syntax actually is.

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[tekton-robot]

Hi @bitsofinfo. 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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[dibyom]

/ok-to-test

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[dibyom]

Can we add a link to cel_expressions.md doc here?

[bitsofinfo]

done

[dibyom]

I promise this is the last thing --- would you mind squashing your commits into one?

Thank you!!

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[bitsofinfo]

can't seem to squash, something jacked in my repo

[bitsofinfo]

i think its good now

[dibyom]

Thank you!
/lgtm