fix: ensure nullable shows in api reference

[RohinBhargava]

Short description of the changes made

• nullable was not showing up correctly in the api reference, now we make sure that it renders correctly

What was the motivation & context behind this PR?

• customer demand

How has this PR been tested?

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Name	Status	Preview	Updated (UTC)
rbac.ferndocs.com	❌ Failed (Inspect)		Jan 14, 2025 5:14pm

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📦 Next.js Bundle Analysis for fern-platform-monorepo

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

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Playwright test results

 99 passed
 2 skipped

Details

 101 tests across 9 suites
 1 minute, 6 seconds
 47fab22

Skipped tests

chromium › posthog.spec.ts › Posthog loads successfully
chromium › websockets/websocket.spec.ts › websocket test