Fix broken link

Author: kartben

articles/iot-hub/iot-hub-devguide-direct-methods.md

@@ -45,7 +45,7 @@ Now, invoke a direct method from a back-end app.
 
 Direct method invocations on a device are HTTPS calls that are made up of the following items:
 
-* The *request URI* specific to the device along with the [API version](/rest/api/iothub/service/invokedevicemethod):
+* The *request URI* specific to the device along with the [API version](/rest/api/iothub/service/devicemethod/invokedevicemethod):
 
     ```http
     https://fully-qualified-iothubname.azure-devices.net/twins/{deviceId}/methods?api-version=2018-06-30