Add missing imports in examples

[MiloszFilimowski]

Description

• Add // ---cut--- twoslash directives with import statements to @example JSDoc blocks in usePermissions.ts so twoslash can resolve useCameraPermissions / useMicrophonePermissions during typedoc builds

Motivation and Context

The example code samples referenced exported hooks without importing them, causing twoslash compilation failures when typedoc generates API docs.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[Copilot]

Pull request overview

This PR adds twoslash directives with import statements to JSDoc @example blocks in the usePermissions.ts file to fix typedoc build failures. The examples previously referenced exported hooks without importing them, which caused twoslash compilation errors during API documentation generation.

Changes:

• Added import statements and // ---cut--- twoslash directives to two JSDoc @example blocks for useCameraPermissions and useMicrophonePermissions hooks

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