gstreamer-docs-1.20.1-bp154.1.17

- Update to version 1.20.1:
  + Various updates in different sub-modules.

- Update to version 1.20.0:
  + Hardware-accelerated GPU plugins will now no longer always list
    all the element variants for all available GPUs, since those
    are system-dependent and it's confusing for users to see those
    in the documentation just because the GStreamer developer who
    generated the docs had multiple GPUs to play with at the time.
    Instead just show the default elements.

- Update to version 1.18.6:
  + Unified documentation containing tutorials, API docs, plugin
    docs, etc. all under one roof, shipped in form of a
    documentation release tarball containing both devhelp and html
    documentation.

- Initial packaging for openSUSE, version 1.18.5