Azure hubs doc reference updated (Rich App)

[JV0812]

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• [ ] Minor Changes - Typos, formatting, slight revisions
• [x] Update Content - Revisions, updating sections
• [ ] New Content - New features, sections, pages, tutorials
• [ ] Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

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