release notes

Author: majocha

docs/release-notes/.FSharp.Compiler.Service/11.0.0.md

@@ -11,6 +11,8 @@
 
 ### Changed
 
-* Parallel compilation stabilised and enabled by default ([PR #18998](https://github.com/dotnet/fsharp/pull/18998))
+* Parallel compilation features: ref resolution, graph based checking, ILXGen and optimization enabled by default ([PR #18998](https://github.com/dotnet/fsharp/pull/18998))
+* Make graph based type checking and parallel optimizations deterministic ([PR #19028](https://github.com/dotnet/fsharp/pull/19028))
+
 
 ### Breaking Changes