fix broken link to tutorials.md page

[clintonsteiner]

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Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [ X] Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• [X ] Has Tests included if any functionality added or changed
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• [ X] Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings). See some examples of good release notes.
• [X ] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

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[tekton-robot]

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[tekton-robot]

Hi @clintonsteiner. 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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[clintonsteiner]

/kind documentation