docs: fix formatting in artifacts.md

[tarilabs]

without leaving an empty line,
the "Example Structure:" would be part of the previous bulletpoint

Changes

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Release Notes

NONE

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[tarilabs]

/kind documentation

[afrittoli]

/ok-to-test

[afrittoli]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: afrittoli

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[tarilabs]

bump, can I get a /lgtm please?

[afrittoli]

/lgtm

[tarilabs]

Thank you @afrittoli 🚀