Merge pull request #15348 from alalek:fix_videoio_doc_version

modules/videoio/doc/videoio_overview.markdown

@@ -59,7 +59,7 @@ cap.open(filename, cv::CAP_DSHOW);
 
 #### How to enable backends
 
-There are two kinds of videoio backends: built-in backends and plugins which will be loaded at runtime (since OpenCV 4.1.1). Use functions cv::videoio_registry::getBackends, cv::videoio_registry::hasBackend and cv::videoio_registry::getBackendName to check actual presence of backend during runtime.
+There are two kinds of videoio backends: built-in backends and plugins which will be loaded at runtime (since OpenCV 4.1.0). Use functions cv::videoio_registry::getBackends, cv::videoio_registry::hasBackend and cv::videoio_registry::getBackendName to check actual presence of backend during runtime.
 
 To enable built-in videoio backends:
   1. Enable corresponding CMake option, e.g. `-DWITH_GSTREAMER=ON`