📝 Update release notes

Author: github-actions

docs/release-notes.md

@@ -9,6 +9,7 @@
 
 ### Fixes
 
+* 🐛 Ensure `rich_markup_mode=None` disables Rich formatting. PR [#859](https://github.com/fastapi/typer/pull/859) by [@svlandeg](https://github.com/svlandeg).
 * 🐛  Fix sourcing of completion path for Git Bash. PR [#801](https://github.com/fastapi/typer/pull/801) by [@svlandeg](https://github.com/svlandeg).
 * 🐛 Fix PowerShell completion with incomplete word. PR [#360](https://github.com/fastapi/typer/pull/360) by [@patricksurry](https://github.com/patricksurry).