Fix broken links in tutorial docs

[kevinbarbour]

Unit test and end-to-end test links led nowhere

Signed-off-by: Kevin Barbour [email protected]

What does this change

Fixes broken links in docs.

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️

Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR

[carolynvs]

Thanks for the fix! 💯