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

[GStreamer (bugzilla.gnome.org)]

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

           Summary: docs: add missing docs and fix errors
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: sebras at hotmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When building the GStreamer documentation I see lots of existing, but missing,
documentation. In these two patches I add the missing docs and fix some errors.

Let me know if there is any issue with these or if you prefer me to separate
something out.

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