Add release notes for optional parameter syntax highlighting fix

Co-authored-by: T-Gro <[email protected]>

Author: Copilot

docs/release-notes/.FSharp.Compiler.Service/10.0.200.md

@@ -1,6 +1,7 @@
 ### Fixed
 
 * Type relations cache: optimize key generation ([Issue #19116](https://github.com/dotnet/fsharp/issues/18767)) ([PR #19120](https://github.com/dotnet/fsharp/pull/19120))
+* Fixed QuickParse to correctly handle optional parameter syntax with `?` prefix, resolving syntax highlighting issues. ([Issue #11008753](https://developercommunity.visualstudio.com/t/F-Highlighting-fails-on-optional-parame/11008753)) ([PR #XXXXX](https://github.com/dotnet/fsharp/pull/XXXXX))
 
 ### Added