Update docs/csharp/whats-new/csharp-14.md

Co-authored-by: Genevieve Warren <[email protected]>

docs/csharp/whats-new/csharp-14.md

@@ -42,6 +42,6 @@ You can find the list of implicit span conversions in the article on [built-in t
 
 ## Unbound generic types and nameof
 
-Beginning with C# 14, the argument to `nameof` can be an unbound generic type. For example, `nameof(List<>)` evaluates to `List`. In earlier versions of C#, only closed generic types, such as `List<int>` had to be used to produce `List`.
+Beginning with C# 14, the argument to `nameof` can be an unbound generic type. For example, `nameof(List<>)` evaluates to `List`. In earlier versions of C#, only closed generic types, such as `List<int>`, could be used to produce `List`.
 
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