message: doc(videoio): fix apiPreference note, replace DSHOW(deprecated)->MSMF
diff: @@ -32,27 +32,26 @@ Select the backend at runtime
  OpenCV automatically selects and uses first available backend (`apiPreference=cv::CAP_ANY`).
  -As advanced usage you can select the backend to use at runtime. Currently this option is
  -available only with %VideoCapture.
  +As advanced usage you can select the backend to use at runtime.
  -For example to grab from default camera using Direct Show as backend
  +For example to grab from default camera using Microsoft Media Foundation (MSMF) as backend
  ```cpp
  //declare a capture object
  -cv::VideoCapture cap(0, cv::CAP_DSHOW);
  +cv::VideoCapture cap(0, cv::CAP_MSMF);
  //or specify the apiPreference with open
  -cap.open(0, cv::CAP_DSHOW);
  +cap.open(0, cv::CAP_MSMF);
  ```
  -If you want to grab from a file using the Direct Show as backend:
  +If you want to grab from a file using the Microsoft Media Foundation (MSMF) as backend:
  ```cpp
  //declare a capture object
  -cv::VideoCapture cap(filename, cv::CAP_DSHOW);
  +cv::VideoCapture cap(filename, cv::CAP_MSMF);
  //or specify the apiPreference with open
  -cap.open(filename, cv::CAP_DSHOW);
  +cap.open(filename, cv::CAP_MSMF);
  ```
  @sa cv::VideoCapture::open() , cv::VideoCapture::VideoCapture()
  