📝 Update release notes

docs/en/docs/release-notes.md

@@ -2,6 +2,7 @@
 
 ## Latest Changes
 
+* ⚡️ Build docs for languages in parallel in subprocesses to speed up CI. PR [#2242](https://github.com/tiangolo/fastapi/pull/2242) by [@tiangolo](https://github.com/tiangolo).
 * 🐛 Fix docs order generation for partial translations. PR [#2238](https://github.com/tiangolo/fastapi/pull/2238) by [@tiangolo](https://github.com/tiangolo).
 * 👥 Update FastAPI People. PR [#2202](https://github.com/tiangolo/fastapi/pull/2202) by [@github-actions[bot]](https://github.com/apps/github-actions).
 * ♻️ Update FastAPI People GitHub Action to send the PR as github-actions. PR [#2201](https://github.com/tiangolo/fastapi/pull/2201) by [@tiangolo](https://github.com/tiangolo).