update the link to official location

Author: Sergey Kanzhelev

README.md

@@ -6,8 +6,8 @@ Telemetry correlation http module enables cross tier telemetry tracking.
 - Start/Stops Activity for the http request
 - Ensure the Activity ambient state is transferred thru the IIS callbacks
 
-See http protocol [specifications](https://github.com/lmolkova/corefx/blob/80e8a8d767a71f413fd7b2f11b507cd395110e8d/src/System.Diagnostics.DiagnosticSource/src/FlatRequestId.md) for details.
+See http protocol [specifications](https://github.com/dotnet/corefx/blob/master/src/System.Diagnostics.DiagnosticSource/src/HttpCorrelationProtocol.md) for details.
 
 
-This http module is used by Application Insights. See [documentation](https://docs.microsoft.com/en-us/azure/application-insights/application-insights-correlation) and [code](https://github.com/Microsoft/ApplicationInsights-dotnet-server).
+This http module is used by Application Insights. See [documentation](https://docs.microsoft.com/azure/application-insights/application-insights-correlation) and [code](https://github.com/Microsoft/ApplicationInsights-dotnet-server).