Update docfx README

Author: GlebChili

docfx_project/README.md

@@ -1,3 +1,15 @@
 # How to build docs
 
-Due to the lack of complete .NET 5 and C# 9.0 support (https://github.com/dotnet/docfx/issues/6790), custom fork of DocFX must be used: https://github.com/GlebChili/docfx/tree/charp-9-workaround-by-tanner-gooding. It contains workaround by [Tanner Gooding](https://github.com/tannergooding).
+Docs must be build with [DocFX Version 2.58](https://github.com/dotnet/docfx) or greater. DocFX version 3.x is not (yet) supported.
+
+Build instructions (given that DocFX is in your `PATH`):
+
+To build docs (compiled docs artifacts will be in the `_site` folder)
+```
+[Path to GmodDotNet repo]\docfx_project> docfx .\docfx.json
+```
+
+To host a local http server and preview docs locally:
+```
+[Path to GmodDotNet repo]\docfx_project> docfx .\docfx.json --serve
+```