Fix table.

Author: Neal Gafter

admin/v7-feature-tracker.md

@@ -42,6 +42,6 @@ Version | Feature | PR | Status | Effort | Notes
 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 | this ref vs ref this ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/meetings/2017/LDM-2017-12-04.md#this-ref-vs-ref-this)) | | | | Small |
-7.3 | by value vs in overload tiebreaker ([MS Proposal](https://github.com/dotnet/csharplang/issues/945)) | | | | 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 |
+7.3 | this ref vs ref this ([MS Proposal](https://github.com/dotnet/csharplang/blob/main/meetings/2017/LDM-2017-12-04.md#this-ref-vs-ref-this)) | | | Small |
+7.3 | by value vs in overload tiebreaker ([MS Proposal](https://github.com/dotnet/csharplang/issues/945)) | | | 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 |