Update README.md

meetings/2024/README.md

@@ -57,8 +57,8 @@ All schedule items must have a public issue or checked-in proposal that can be l
 
 ### Mon Feb 26, 2024
 
+- Short discussion on allows ref struct
 - Breaking change with collection expressions and UI collection types (https://github.com/dotnet/roslyn/issues/72098).  Cyrus + Chuck
-- Breaking change with immutable arrays and collection expressions on downlevel scenarios (https://github.com/dotnet/roslyn/issues/72170).  Cyrus + Chuck
 - Dictionary-expressions + Collection-expressions future: WG to go over our plans, and the initial design space (Cyrus)
 
 ## C# Language Design Notes for 2024