Update existing documentation for various behaviours. Add new information on how selection "upstream" of decodebin3 happens. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1905>
Update existing documentation for various behaviours. Add new information on how selection "upstream" of decodebin3 happens. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1905>