📝 Update release notes

docs/en/docs/release-notes.md

@@ -15,6 +15,10 @@ hide:
 * 📝 Fix inconsistent response code when item already exists in docs for testing. PR [#11818](https://github.com/fastapi/fastapi/pull/11818) by [@lokomilo](https://github.com/lokomilo).
 * 📝 Update `docs/en/docs/tutorial/body.md` with Python 3.10 union type example. PR [#11415](https://github.com/fastapi/fastapi/pull/11415) by [@rangzen](https://github.com/rangzen).
 
+### Internal
+
+* ⚙️ Record and show test coverage contexts (what test covers which line). PR [#11518](https://github.com/fastapi/fastapi/pull/11518) by [@slafs](https://github.com/slafs).
+
 ## 0.112.1
 
 ### Upgrades