Fix system arguments link in side nav

[camertron]

What are you trying to accomplish?

The system arguments docs have moved to Lookbook. Although the docs hosted in this repo will go away soon, for completeness this PR updates the side nav link here too.

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: 61fd612

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