Adding comment wrt xcurl (#711)

Source/HTTP/Curl/CurlEasyRequest.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #if HC_PLATFORM == HC_PLATFORM_GDK
+// When developing titles for Xbox consoles, you must use WinHTTP or xCurl. 
+// See https://docs.microsoft.com/en-us/gaming/gdk/_content/gc/networking/overviews/web-requests/http-networking for detail
 #include <XCurl.h>
 #else
 // This path is untested, but this http provider should work with other curl implementations as well.