.net 5 to .net 6

Author: lsaudon

.github/workflows/pr.yml

@@ -32,4 +32,4 @@ jobs:
       - name: Build FSharp.Formatting master
         run: cd FSharp.Formatting && .\build -t Build
       - name: Run fsdocs
-        run: dotnet FSharp.Formatting\src\fsdocs-tool\bin\Release\net5.0\fsdocs.dll build --sourcefolder fsharp
+        run: dotnet FSharp.Formatting\src\fsdocs-tool\bin\Release\net6.0\fsdocs.dll build --sourcefolder fsharp