Update docs/coding-guidelines/adding-api-guidelines.md

Author: jkotas

docs/coding-guidelines/adding-api-guidelines.md

@@ -43,7 +43,7 @@ should be added to `net10.0`. [More Information on TargetFrameworks](https://lea
 ## Documentation
 
 New public APIs must be documented with triple-slash comments on top of them. Visual Studio automatically generates the structure for you when you type `///`.
-
+See [guidelines for creating .NET API documentation](https://github.com/dotnet/dotnet-api-docs/wiki).
 If your new API or the APIs it calls throw any exceptions, those need to be manually documented by adding the `<exception></exception>` elements.
 
 ### Documentation Workflow