Record "extended property patterns" feature as done (#53953)

* Record "extended property patterns" feature as done
* Add "async method builder override" feature

docs/Language Feature Status.md

@@ -27,9 +27,10 @@ efforts behind them.
 | [Constant Interpolated Strings](https://github.com/dotnet/csharplang/issues/2951) | main | [Merged into 16.9p3](https://github.com/dotnet/roslyn/pull/49676) | [kevinsun-dev](https://github.com/kevinsun-dev) | [333fred](https://github.com/333fred) | [jaredar](https://github.com/jaredpar), [agocke](https://github.com/agocke) |
 | [Mix declarations and variables in deconstruction](https://github.com/dotnet/csharplang/issues/125) | main | [Merged into 16.10](https://github.com/dotnet/roslyn/issues/47746) | [YairHalberstadt ](https://github.com/YairHalberstadt) | [jcouv](https://github.com/jcouv) | [MadsTorgersen](https://github.com/MadsTorgersen) |
 | [List patterns](https://github.com/dotnet/csharplang/issues/3435) | [list-patterns](https://github.com/dotnet/roslyn/tree/features/list-patterns) | [In Progress](https://github.com/dotnet/roslyn/issues/51289) | [alrz](https://github.com/alrz) | [jcouv](https://github.com/jcouv), [333fred](https://github.com/333fred) | [333fred](https://github.com/333fred) |
-| [Extended property patterns](https://github.com/dotnet/csharplang/issues/4394) | [extended-property-patterns](https://github.com/dotnet/roslyn/tree/features/extended-property-patterns) | [In Progress](https://github.com/dotnet/roslyn/issues/52468) | [alrz](https://github.com/alrz) | [333fred](https://github.com/333fred) (Tentative), [jcouv](https://github.com/jcouv) | [333fred](https://github.com/333fred) |
+| [Extended property patterns](https://github.com/dotnet/csharplang/issues/4394) | [extended-property-patterns](https://github.com/dotnet/roslyn/tree/features/extended-property-patterns) | [Merged into 17.0](https://github.com/dotnet/roslyn/issues/52468) | [alrz](https://github.com/alrz) | [jcouv](https://github.com/jcouv), [333fred](https://github.com/333fred) | [333fred](https://github.com/333fred) |
 | [Sealed record ToString](https://github.com/dotnet/csharplang/issues/4174) | main | [Merged](https://github.com/dotnet/roslyn/issues/52031) | [thomaslevesque](https://github.com/thomaslevesque/) | [jcouv](https://github.com/jcouv) | [333fred](https://github.com/333fred) |
 | [Source Generator V2 APIs](https://github.com/dotnet/roslyn/issues/51257) | [features/source-generators](https://github.com/dotnet/roslyn/tree/features/source-generators) | [In Progress](https://github.com/dotnet/roslyn/issues/51257) | [chsienki](https://github.com/chsienki/) | [rikkigibson](https://github.com/rikkigibson), [jaredpar](https://github.com/jaredpar), [cston](https://github.com/cston) | N/A |
+| [Async method builder override](https://github.com/dotnet/csharplang/issues/1407) | main | [In Progress](https://github.com/dotnet/roslyn/issues/51999) | [jcouv](https://github.com/jcouv) | TBD | [stephentoub](https://github.com/stephentoub) |
 
 # VB 16.9