Merge two features into an existing table entry.

Author: Neal Gafter

admin/v7-feature-tracker.md

@@ -37,9 +37,8 @@ Version | Feature | PR | Status | Effort | Notes
 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 | 
 7.3 | Support for Pattern-Based `fixed` Statements ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/pattern-based-fixed.md)) | [240](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/240) | Open | Small |  
-7.3 | use additional generic constraints ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/blittable.md)) | [244](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/244) | Open | Small | 
+7.3 | use additional generic constraints ([MS Proposal 1](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/blittable.md)) ([MS proposal 2](https://github.com/dotnet/csharplang/issues/104)) ([MS proposal 3](https://github.com/dotnet/csharplang/issues/103)) | [244](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/244) | Open | Small | 
 7.3 | test `==` and `!=` with tuple types ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/tuple-equality.md)) | [63](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/63) **but needs some work** | Open | Large | Feature Group C.
 7.3 | use expression variables in more locations ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/expression-variables-in-initializers.md)) | [44](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/44), [61](https://github.com/ECMA-TC49-TG2/csharpstandard/pull/61) | Open | Medium | Feature Group B and D.
 7.3 | attach attributes to the backing field of auto-implemented properties ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/auto-prop-field-attrs.md)) | [262](https://github.com/dotnet/csharpstandard/pull/262) | Open | Small | 
 7.3 | overload resolution now has fewer ambiguous cases ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/proposals/csharp-7.3/improved-overload-candidates.md)) | [263](https://github.com/dotnet/csharpstandard/pull/263) | Open | Small | 
-7.3 | permit `System.Enum` and `System.Delegate` as constraints ([MS proposal 1](https://github.com/dotnet/csharplang/issues/104)) ([MS proposal 2](https://github.com/dotnet/csharplang/issues/103)) | | | Small |