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

Changes – 2025-08-10: Revise "What's New" Documentation Section (db81173)

[Impact: High] A new page titled "What is the Fabric Adoption Framework?" has been created, providing an introduction and overview of best practices for adopting Microsoft Fabric.
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[Impact: Medium] The sidebar for the "1 - Define strategy" category has been updated to be collapsed by default, improving the initial user experience by reducing clutter.
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[Impact: Medium] The sidebar for the "Foundational methodologies" category has also been set to collapsed by default, enhancing navigation by allowing users to expand only the sections they are interested in.
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[Impact: High] The document "Assess your Fabric adoption strategy" has been completely removed, eliminating a key resource for users assessing their Microsoft Fabric adoption strategy.
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[Impact: Medium] A structured Table of Contents has been added to the new page, improving navigation and allowing users to quickly find relevant sections.
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Why it matters: These changes enhance the clarity and usability of the documentation, making it easier for readers to understand and navigate the Fabric adoption framework.