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:

• [X ] 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
• [ X] pre-commit Passed
• [X ] Follows the commit message standard
• [ X] Meets the Tekton contributor standards (including functionality, content, code)
• [ X] Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• [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

NONE

[linux-foundation-easycla]

• ✅login: clintonsteiner / (16d1040)

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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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[jerop]

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

[tekton-robot]

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