Document use of `findUnique` with MongoDB composite types

[keerlu]

Describe this PR

Added examples of using findUnique with a multi-field constraint containing a composite type to:

• the client reference entry for findUnique
• Names in the underlying database concepts page

Changes

What issue does this fix?

Fixes #3453

Any other relevant information

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docs	✅ Ready (Inspect)	Visit Preview	Aug 26, 2022 at 11:25AM (UTC)

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[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)