Add documentation for the EditorNotices component

[nateinaction]

What?

Part of: #60358

Added JSDoc to EditorNotices component and rendered documentation for the readme.

How?

Added JSDocs formatted doc blocks to existing EditorNotices component.
Ran npm run docs:build to render new README.md
Ran npm run lint:js packages/editor/src/components/editor-notices/index.js --fix to ensure we wouldn't hit any linter issues in CI.

[github-actions]

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Co-authored-by: nateinaction <[email protected]>
Co-authored-by: colorful-tones <[email protected]>

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[github-actions]

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[ntsekouras]

Thank you!