📝 Update release notes

docs/en/docs/release-notes.md

@@ -14,6 +14,7 @@ hide:
 
 ### Docs
 
+* 📝 Add Asyncer mention in async docs. PR [#12037](https://github.com/fastapi/fastapi/pull/12037) by [@tiangolo](https://github.com/tiangolo).
 * 📝 Move the Features docs to the top level to improve the main page menu. PR [#12036](https://github.com/fastapi/fastapi/pull/12036) by [@tiangolo](https://github.com/tiangolo).
 * ✏️ Fix import typo in reference example for `Security`. PR [#11168](https://github.com/fastapi/fastapi/pull/11168) by [@0shah0](https://github.com/0shah0).
 * 📝 Highlight correct line in tutorial `docs/en/docs/tutorial/body-multiple-params.md`. PR [#11978](https://github.com/fastapi/fastapi/pull/11978) by [@svlandeg](https://github.com/svlandeg).