[Bug 725521] docs: Fix argument and annotation typos, add missing annotations and remove duplicate section

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725521
  GStreamer | gst-plugins-base | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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 Attachment #270724|none                        |committed
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