update outputs structure

Outputs.md

@@ -57,7 +57,7 @@ result: Result = {
       }
       tensor:      // if config.face.detector.return is set to true, detector will return
                    // a raw tensor containing cropped image of a face
-                   // note that tensors must be explicitly disposed to free memory by calling tensor.dispose();
+                   // note that tensors must be explicitly disposed to free memory by calling tf.dispose(tensor);
     }
   ],
   body:            // <array of detected objects>