message: Fix typo in videoio doc
diff: @@ -77,7 +77,7 @@ for the operating system. Thus you can't use VideoCapture or VideoWriter with t
  To get access to their devices, manufactures provide their own C++ API and library that you have to
  include and link with your OpenCV application.
  -Is common case that this libraries read/write images from/to a memory buffer. If it so, it is
  +It is a common case that these libraries read/write images from/to a memory buffer. If it so, it is
  possible to make a `Mat` header for memory buffer (user-allocated data) and process it
  in-place using OpenCV functions. See cv::Mat::Mat() for more details.
  @@ -85,9 +85,9 @@ The FFmpeg library
  ------------------
  OpenCV can use the FFmpeg library (http://ffmpeg.org/) as backend to record, convert and stream audio and video.
  -FFMpeg is a complete, cross-reference solution. If you enable FFmpeg while configuring OpenCV than
  +FFmpeg is a complete, cross-reference solution. If you enable FFmpeg while configuring OpenCV than
  CMake will download and install the binaries in `OPENCV_SOURCE_CODE/3rdparty/ffmpeg/`. To use
  -FFMpeg at runtime, you must deploy the FFMepg binaries with your application.
  +FFmpeg at runtime, you must deploy the FFMepg binaries with your application.
  @note FFmpeg is licensed under the GNU Lesser General Public License (LGPL) version 2.1 or later.
  See `OPENCV_SOURCE_CODE/3rdparty/ffmpeg/readme.txt` and http://ffmpeg.org/legal.html for details and
  