[Bug 740833] validate: fix typo in documentation

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740833
  GStreamer | gst-devtools | unspecified

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> 2014-11-28 05:45:07 UTC ---
Created an attachment (id=291696)
 View: https://bugzilla.gnome.org/attachment.cgi?id=291696
 Review: https://bugzilla.gnome.org/review?bug=740833&attachment=291696

fix typo in documentation

Please review

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