docs: replace link to link to page with link to page

[clintonsteiner]

• Previously documentation link pointed to https://github.com/tektoncd/pipeline/blob/main/docs/tutorial.md which then pointed you onwards to https://tekton.dev/docs/getting-started/
• Simplify this by directly pointing user to end destination
  /kind documentation

Changes

Submitter Checklist

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

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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[linux-foundation-easycla]

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• ✅ login: clintonsteiner / name: csteiner (a6526bc, 16d1040)

[tekton-robot]

Hi @clintonsteiner. Thanks for your PR.

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[jerop]

could you also delete tutorial.md if it's no longer used?

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop

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[clintonsteiner]

could you also delete tutorial.md if it's no longer used?

Yes - added a separate commit removing that file in case others want this preserved
Thanks for the review

[afrittoli]

/ok-to-test

[afrittoli]

/lgtm