[Bug 777647] Document the videotestsrc num-buffers property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777647

--- Comment #1 from Sam Thursfield <ssssam at gmail.com> ---
Created attachment 344035
  --> https://bugzilla.gnome.org/attachment.cgi?id=344035&action=edit
Document the videotestsrc num-buffers property

It's not obvious from the existing docs that this option exists, nor
that it can be used to give a pipeline an exact length in video frames.

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