fix index page reference

Author: kMutagene

docs/index.fsx

@@ -20,7 +20,7 @@ Include the compiled binaries of your project to use in the docs like this.
 Make sure to load any external references via nuget.
 *)
 #r "nuget: BioFSharp, 2.0.0-preview.3"
-#I @"..\src\BioFSharp.XYZ\bin\Release\net8.0"
+#I @"..\src\BioFSharp.XYZ\bin\Release\netstandard2.0"
 #r "BioFSharp.XYZ.dll"
 
 open BioFSharp.XYZ