message: Fix VideoCapture::open() brief description
diff: @@ -751,7 +751,7 @@ public:
  */
  CV_WRAP virtual bool open(const String& filename, int apiPreference = CAP_ANY);
  - /** @brief Opens a camera for video capturing
  + /** @brief Opens a video file or a capturing device or an IP video stream for video capturing with API Preference and parameters
  @overload
  @@ -775,7 +775,7 @@ public:
  */
  CV_WRAP virtual bool open(int index, int apiPreference = CAP_ANY);
  - /** @brief Returns true if video capturing has been initialized already.
  + /** @brief Opens a camera for video capturing with API Preference and parameters
  @overload
  