[Bug 764113] docs: add GstAudioVisualizer to documentation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764113

--- Comment #1 from Luis de Bethencourt <luis at debethencourt.com> ---
I can work on this after the Easter long weekend.

Thanks for pointing it out :)

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