docs: fix ts error in math examples

[gotjoshua]

Issue for this PR

no issue - the provided examples don't work - this fixes them in a very minimalistic way

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

simple code example fix so the example will work

How did you verify your code works?

by adding the examples to a project .opencode/tools/file.ts and running them

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[gotjoshua]

If you believe this was flagged incorrectly, please let a maintainer know.

@anomalyco - i think this is a simple enough PR that it need not be so strict (in general docs only PRs don't need all of the template sections to be there)

[rekram1-node]

Automated PR Cleanup

Thank you for contributing to opencode.

Due to the high volume of PRs from users and AI agents, we periodically close older PRs using automated criteria so maintainers can focus review time on the most active and community-supported contributions.

This PR was closed because it matched the following cleanup criteria:

• The PR was created more than 1 month ago
• The PR had fewer than 2 positive reactions
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[gotjoshua]

PR was closed incorrectly,
@rekram1-node technically it doesn't have the positive reactions, so not closed "incorrectly"

annnd, it is a small but meaningful documentation change, i can get some friends to thumbs up, but i think you can also just have a very quick look and merge it (unless upstream has changed so much it creates conflicts)

[rekram1-node]

thx didnt see this, merged

Note that my automated messages are automated so im not sending them manually