Fix CHANGELOG.md formatting for PR #3766 reference#1

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Copilot wants to merge 4 commits intomainfrom

copilot/fix-b6a5c464-27ed-4fb2-8126-c31b1cc1008f

Commits on Sep 28, 2025

docs(fastapi): add section on environment variables, trace propagation, websockets, logging, and package links
UltimatePlutoC
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Commits on Sep 30, 2025