[Bug 719614] docs: add missing docs and fix errors

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719614
  GStreamer | gstreamer (core) | git

--- Comment #2 from Sebastian Rasmussen <sebras at hotmail.com> 2013-11-30 17:14:16 UTC ---
Created an attachment (id=263210)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263210
 Review: https://bugzilla.gnome.org/review?bug=719614&attachment=263210

Proposed patch with slightly more invasive changes

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