📝 Update release notes

docs/en/docs/release-notes.md

@@ -2,6 +2,7 @@
 
 ## Latest Changes
 
+* ✅ Add  the `docs_src` directory to test coverage and update tests. PR [#1904](https://github.com/tiangolo/fastapi/pull/1904) by [@Kludex](https://github.com/Kludex).
 * 🌐 Add Japanese translation for `docs/tutorial/security/oauth2-jwt.md`. PR [#3526](https://github.com/tiangolo/fastapi/pull/3526) by [@sattosan](https://github.com/sattosan).
 * 🔧 Add new GitHub templates with forms for new issues. PR [#3612](https://github.com/tiangolo/fastapi/pull/3612) by [@tiangolo](https://github.com/tiangolo).
 * 📝 Add official FastAPI Twitter to docs: [@fastapi](https://twitter.com/fastapi). PR [#3578](https://github.com/tiangolo/fastapi/pull/3578) by [@tiangolo](https://github.com/tiangolo).