broken link at page 54

[ghost]

Chapter 2, Understanding C# Standards the link:

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/specifications

says 404 not found.

[markjprice]

I have added this as an errata item: https://github.com/markjprice/cs12dotnet8/blob/main/docs/errata/errata.md#page-54---understanding-c-standards