C# Generated Code Guide claims only proto3 supported
The C# Generated Code Guide claims that the C# code generator only supports proto3 and requires that all .proto files begin with
syntax = "proto3";
despite Editions being supported in C# since v27.0.
Thanks for raising this issue. I'm actually right now doing a pass over all docs to add Editions information to them. (It's taking a long time to get through them all.) Keep your eyes peeled over the next couple of weeks for updates across the docs.
I'm still working on this. Just this week, I updated the C# topic internally. The next publish will update the external docs.
Docs are updated and now use Edition 2023 for examples. I did miss the subtitle, which says "...using proto3 syntax." I'll fix that on the next publish.