Let me clarify to help you with this.
SDL Tridion Docs comes in different WCF endpoints for different services.
Here is the list of WCF services available and Web Services classes and methods refer to the SDL documentation it provided web service each methods request and response XMLs detail, to start with you are already found the document for "using ....
Reference sample Code for Unpublish PageByUrl using CoreService:
static void Main(string args)