[Bug 770428] docs: fix typo on stream selection

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770428

--- Comment #1 from Wonchul Lee <chul0812 at gmail.com> ---
Created attachment 334204
  --> https://bugzilla.gnome.org/attachment.cgi?id=334204&action=edit
fixed type on stream selection

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