This commit: docs(changelog): update whats-new and per-commit entries [skip ci]

Changes – 2025-08-10: Revise "What's New" section removal (705555e)

[Impact: High] Content update: A new document titled "What's new in the Fabric Adoption Framework" has been created to inform users about recent updates and changes, enhancing visibility of important information.
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[Impact: Medium] Navigation change: The new "What's new" document has been added to the sidebar at position 2, improving accessibility for users seeking updates.
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[Impact: High] Content update: Expanded the section on motivations for adopting Microsoft Fabric with clearer definitions, enhancing reader understanding of strategic alignment and prioritization.
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[Impact: Medium] Content update: Added new recommendations and diagrams to enhance guidance for Microsoft Fabric adoption, providing clearer strategies for organizations.
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[Impact: Medium] Content update: Introduced flowcharts that visually represent key concepts such as executive buy-in and resource allocation, improving comprehension of the adoption process.
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[Impact: Medium] Content update: The introduction of the "Fabric adoption strategy assessment" article has been updated to clarify its purpose and improve user expectations.
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[Impact: Low] No reader-visible documentation changes.
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Why it matters: These changes improve the clarity, usability, and accessibility of the documentation, making it easier for organizations to adopt Microsoft Fabric effectively.