Use new system args docs url

[camertron]

What are you trying to accomplish?

We recently moved the docs for system arguments to Lookbook. While the old docsite is mostly gone, let's fix the URL for completeness sake.

Integration

No changes needed in prod.

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

[changeset-bot]

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Latest commit: 7971dce

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