Restored branch: document `findUnique` with composite types

[andrew-walford-prisma]

This material has already passed tech review from Cristian and Dan. Waiting for the feature to go live before we merge it.

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Name	Status	Preview	Updated
docs	✅ Ready (Inspect)	Visit Preview	Sep 5, 2022 at 8:20AM (UTC)

[github-actions[bot]]

This PR changes the following pages (Netlify/Vercel Preview Deploy links):

Changed Netlify links

• /docs/concepts/components/prisma-schema/names-in-underlying-database (currently)
• /docs/concepts/components/prisma-client/composite-types (currently)
• /docs/reference/api-reference/prisma-client-reference (currently)

Changed Vercel links

• /docs/concepts/components/prisma-schema/names-in-underlying-database (currently)
• /docs/concepts/components/prisma-client/composite-types (currently)
• /docs/reference/api-reference/prisma-client-reference (currently)

(Note that links will only be valid after Netlify/Vercel preview deploy succeeded)