Updated documentation for SkiaSharp 3.x

[ElijahSink]

The current documentation at https://learn.microsoft.com/en-us/dotnet/api/skiasharp only goes up to version 2.88. Now that a release version of 3.x has been out for a few months, can this documentation be updated?

[henriquebelotto]

It seems that no one really cares about that... unfortunately.

[darenm]

@ElijahSink @henriquebelotto I noticed that they are in the process of merging the documentation into the source as embedded comments: mono/SkiaSharp#3357