Update validation.ts

[lorenzolewis]

Describe what your pull request does. If appropriate, add GIFs or images showing the before and after.

Change Type

• sdk — Changes the tldraw SDK
• dotcom — Changes the tldraw.com web app
• docs — Changes to the documentation, examples, or templates.
• vs code — Changes to the vscode plugin
• internal — Does not affect user-facing stuff

• bugfix — Bug fix
• feature — New feature
• improvement — Improving existing features
• chore — Updating dependencies, other boring stuff
• galaxy brain — Architectural changes
• tests — Changes to any test code
• tools — Changes to infrastructure, CI, internal scripts, debugging tools, etc.
• dunno — I don't know

Test Plan

N/A

• Unit Tests
• End to end tests

Release Notes

• Update example for Union type

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I believe this type was changed and literal is what it should be now.

[vercel]

@lorenzolewis is attempting to deploy a commit to the tldraw Team on Vercel.

A member of the Team first needs to authorize it.