Update admin/v7-feature-tracker.md

Author: gafter

admin/v7-feature-tracker.md

@@ -32,7 +32,7 @@ Version | Feature | PR | Status | Effort | Notes
 7.2 | `in` parameter modifier ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.2/readonly-ref.md)) | [219](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/219) | Open | Medium | Feature Group F.
 7.2 | `ref` with `this` in extension methods ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.2/ref-extension-methods.md)) | [219](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/219) | Open | Medium | Feature Group F.
 7.2 | `readonly` structs ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.2/readonly-struct.md)) | [333](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/333) | Open | Small | 
-7.2 | `ref` structs ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.2/span-safety.md)) | [333](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/333) | Open | Medium | 
+7.2 | `ref` structs ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.2/span-safety.md)) | | Open | Medium | 
 7.3 | indexing movable fixed buffer without pinning ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/indexing-movable-fixed-fields.md)) | [239](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/239) | Open | Small |  
 7.3 | reassign `ref` local variables ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/ref-local-reassignment.md)) | [213](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/213) **but needs work**  | Open | Medium | Feature Group E.
 7.3 | use initializers on `stackalloc` arrays ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/stackalloc-array-initializers.md)) | [238](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/238) | Open | Small |