Array: fix flatMapNullable implementation and add descriptions / ex…

[gcanti]

…amples

Type

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

[changeset-bot]

🦋 Changeset detected

Latest commit: d74e4f4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 24 packages

Name	Type
effect	Patch
@effect/cli	Patch
@effect/experimental	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/platform	Patch
@effect/printer-ansi	Patch
@effect/printer	Patch
@effect/rpc-http	Patch
@effect/rpc	Patch
@effect/schema	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/sql	Patch
@effect/typeclass	Patch
@effect/vitest	Patch

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