Update Language Feature Status (#32914)

docs/Language Feature Status.md

@@ -11,21 +11,22 @@ efforts behind them.
 | Feature | Branch | State | Developers | Reviewer | LDM Champ |
 | ------- | ------ | ----- | ---------- | -------- | --------- |
 | [Default Interface Methods](https://github.com/dotnet/csharplang/blob/master/proposals/default-interface-methods.md) | [defaultInterfaceImplementation](https://github.com/dotnet/roslyn/tree/features/DefaultInterfaceImplementation) | [Prototype](https://github.com/dotnet/roslyn/issues/19217) | [AlekseyTs](https://github.com/AlekseyTs) | [gafter](https://github.com/gafter) | [gafter](https://github.com/gafter) |
-| [Nullable reference type](https://github.com/dotnet/csharplang/blob/master/proposals/nullable-reference-types.md) | [NullableReferenceTypes](https://github.com/dotnet/roslyn/tree/features/NullableReferenceTypes) | [Merged to dev16 preview1](https://github.com/dotnet/roslyn/issues/22152) | [cston](https://github.com/cston), [jcouv](https://github.com/jcouv) | [AlekseyTs](https://github.com/AlekseyTs), [333fred](https://github.com/333fred) | [mattwar](https://github.com/mattwar) |
-| [Recursive patterns](https://github.com/dotnet/csharplang/blob/master/proposals/patterns.md) | [recursive-patterns](https://github.com/dotnet/roslyn/tree/features/recursive-patterns) | [Merged to dev16 preview2](https://github.com/dotnet/roslyn/issues/25935) | [gafter](https://github.com/gafter) | [agocke](https://github.com/agocke), [cston](https://github.com/cston) | [gafter](https://github.com/gafter) |
-| [Async streams](https://github.com/dotnet/csharplang/blob/master/proposals/async-streams.md) | [async-streams](https://github.com/dotnet/roslyn/tree/features/async-streams) | [Merged to dev16 preview1](https://github.com/dotnet/roslyn/issues/24037) | [jcouv](https://github.com/jcouv) |  [agocke](https://github.com/agocke) | [stephentoub](https://github.com/stephentoub) |
+| [Nullable reference type](https://github.com/dotnet/csharplang/blob/master/proposals/nullable-reference-types.md) | [NullableReferenceTypes](https://github.com/dotnet/roslyn/tree/features/NullableReferenceTypes) | [Merged to dev16.0 preview1](https://github.com/dotnet/roslyn/issues/22152) | [cston](https://github.com/cston), [jcouv](https://github.com/jcouv) | [AlekseyTs](https://github.com/AlekseyTs), [333fred](https://github.com/333fred) | [mattwar](https://github.com/mattwar) |
+| [Recursive patterns](https://github.com/dotnet/csharplang/blob/master/proposals/patterns.md) | [recursive-patterns](https://github.com/dotnet/roslyn/tree/features/recursive-patterns) | [Merged to dev16.0 preview2](https://github.com/dotnet/roslyn/issues/25935) | [gafter](https://github.com/gafter) | [agocke](https://github.com/agocke), [cston](https://github.com/cston) | [gafter](https://github.com/gafter) |
+| [Async streams](https://github.com/dotnet/csharplang/blob/master/proposals/async-streams.md) | [async-streams](https://github.com/dotnet/roslyn/tree/features/async-streams) | [Merged to dev16.0 preview1](https://github.com/dotnet/roslyn/issues/24037) | [jcouv](https://github.com/jcouv) |  [agocke](https://github.com/agocke) | [stephentoub](https://github.com/stephentoub) |
 | [Caller expression attribute](https://github.com/dotnet/csharplang/issues/287) | [caller-expression](https://github.com/dotnet/roslyn/tree/features/caller-expression) | Prototype | [alrz](https://github.com/alrz) | [jcouv](https://github.com/jcouv) | [jcouv](https://github.com/jcouv) |
 | [Target-typed new](https://github.com/dotnet/csharplang/issues/100) | [target-typed-new](https://github.com/dotnet/roslyn/tree/features/target-typed-new) | [Prototype](https://github.com/dotnet/roslyn/issues/28489) | [alrz](https://github.com/alrz) | [jcouv](https://github.com/jcouv) | [jcouv](https://github.com/jcouv) |
-| [Enhanced using](https://github.com/dotnet/csharplang/issues/1623) | [enhanced-using](https://github.com/dotnet/roslyn/tree/features/enhanced-using) | [Merged to dev16 preview2](https://github.com/dotnet/roslyn/issues/28588) | [chsienki](https://github.com/chsienki) | [agocke](https://github.com/agocke) | [jaredpar](https://github.com/jaredpar) |
+| [Enhanced using](https://github.com/dotnet/csharplang/issues/1623) | [enhanced-using](https://github.com/dotnet/roslyn/tree/features/enhanced-using) | [Merged to dev16.0 preview2](https://github.com/dotnet/roslyn/issues/28588) | [chsienki](https://github.com/chsienki) | [agocke](https://github.com/agocke) | [jaredpar](https://github.com/jaredpar) |
 | [Generic attributes](https://github.com/dotnet/csharplang/issues/124) | [generic-attributes](https://github.com/dotnet/roslyn/tree/features/generic-attributes) | In Progress | [AviAvni](https://github.com/AviAvni) | [agocke](https://github.com/agocke) | [mattwar](https://github.com/mattwar) |
-| [Ranges](https://github.com/dotnet/roslyn/blob/features/range/docs/features/range.md) | [range](https://github.com/dotnet/roslyn/tree/features/range) | [Merged to dev16 preview1](https://github.com/dotnet/roslyn/issues/23205) | [agocke](https://github.com/agocke) | [cston](https://github.com/cston) | [jaredpar](https://github.com/jaredpar) |
+| [Ranges](https://github.com/dotnet/roslyn/blob/features/range/docs/features/range.md) | [range](https://github.com/dotnet/roslyn/tree/features/range) | [Merged to dev16.0 preview1](https://github.com/dotnet/roslyn/issues/23205) | [agocke](https://github.com/agocke) | [cston](https://github.com/cston) | [jaredpar](https://github.com/jaredpar) |
 | [Default in deconstruction](https://github.com/dotnet/roslyn/pull/25562) | [decon-default](https://github.com/dotnet/roslyn/tree/features/decon-default) | [Implemented](https://github.com/dotnet/roslyn/issues/25559) | [jcouv](https://github.com/jcouv) | [gafter](https://github.com/gafter) | [jcouv](https://github.com/jcouv) |
 | [Relax ordering of `ref` and `partial` modifiers](https://github.com/dotnet/csharplang/issues/946) | [ref-partial](https://github.com/dotnet/roslyn/tree/features/ref-partial) | In Progress | [alrz](https://github.com/alrz) | [gafter](https://github.com/gafter)  | [jcouv](https://github.com/jcouv) |
-| [Null-coalescing Assignment](https://github.com/dotnet/csharplang/issues/34) | master | [Merged to dev16 preview1](https://github.com/dotnet/roslyn/issues/29168) | [333fred](https://github.com/333fred) | [cston](https://github.com/cston) | [gafter](https://github.com/gafter)
-| [Alternative interpolated verbatim strings](https://github.com/dotnet/csharplang/issues/1630) | master | Merged to dev16 preview1 | [jcouv](https://github.com/jcouv) | [cston](https://github.com/cston) | [jcouv](https://github.com/jcouv)
+| [Null-coalescing Assignment](https://github.com/dotnet/csharplang/issues/34) | master | [Merged to dev16.0 preview1](https://github.com/dotnet/roslyn/issues/29168) | [333fred](https://github.com/333fred) | [cston](https://github.com/cston) | [gafter](https://github.com/gafter)
+| [Alternative interpolated verbatim strings](https://github.com/dotnet/csharplang/issues/1630) | master | Merged to dev16.0 preview1 | [jcouv](https://github.com/jcouv) | [cston](https://github.com/cston) | [jcouv](https://github.com/jcouv)
 | [stackalloc in nested contexts](https://github.com/dotnet/csharplang/issues/1412) | [nested-stackalloc](https://github.com/dotnet/roslyn/tree/features/nested-stackalloc) | [In Progress](https://github.com/dotnet/roslyn/issues/28968) | [gafter](https://github.com/gafter) | - | [gafter](https://github.com/gafter)
-| [Unmanaged generic structs](https://github.com/dotnet/csharplang/issues/1744) | master | [In Progress](https://github.com/dotnet/roslyn/issues/31374) | [RikkiGibson](https://github.com/RikkiGibson) | - | [jaredpar](https://github.com/jaredpar) |
-| [Static local functions](https://github.com/dotnet/csharplang/issues/1565) | master | [Implemented](https://github.com/dotnet/roslyn/issues/32069) | [cston](https://github.com/cston) | [jaredpar](https://github.com/jaredpar) | [jcouv](https://github.com/jcouv)
+| [Unmanaged generic structs](https://github.com/dotnet/csharplang/issues/1744) | master | [Merged to dev16.1 preview1](https://github.com/dotnet/roslyn/issues/31374) | [RikkiGibson](https://github.com/RikkiGibson) | - | [jaredpar](https://github.com/jaredpar) |
+| [Static local functions](https://github.com/dotnet/csharplang/issues/1565) | master | [Merged in dev16.0 preview2](https://github.com/dotnet/roslyn/issues/32069) | [cston](https://github.com/cston) | [jaredpar](https://github.com/jaredpar) | [jcouv](https://github.com/jcouv)
+| [Readonly members](https://github.com/dotnet/csharplang/issues/1710) | [readonly-members](https://github.com/dotnet/roslyn/tree/features/readonly-members) | [Prototype](https://github.com/dotnet/roslyn/issues/32911) | [RikkiGibson](https://github.com/RikkiGibson) | TBD | [jaredpar](https://github.com/jaredpar)
 
 # VB 16.0