[Bug 765853] timeline: rename "track-element" to "track_element" in select-tracks-for-object documentation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765853

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 327075
  --> https://bugzilla.gnome.org/attachment.cgi?id=327075&action=edit
timeline: rename "track-element" to "track_element" in select-tracks-for-object
documentation

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