[Bug 721190] Update some api docs (window, context, display)

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721190
  GStreamer | gst-plugins-gl | git

--- Comment #4 from Matthew Waters <ystreet00 at gmail.com> 2013-12-29 06:37:00 UTC ---
Created an attachment (id=264989)
 View: https://bugzilla.gnome.org/attachment.cgi?id=264989
 Review: https://bugzilla.gnome.org/review?bug=721190&attachment=264989

window: provide some documentation

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