Gary Wilson Jr. committed 4f307d6

Updated path to image.

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blog/2011/03/14/drawing-petri-nets.rst get an image that looks something like this:
-  .. image:: barber.png
+  .. image:: /blog/2011/03/14/barber.png
       :alt: Petri net barber example
   However, there doesn't seem to be a very good way for drawing the tokens within the place nodes.  Nodes can define text labels, but using periods for tokens isn't very readable. Alternatively, since nodes can specify a background image, you could generate a few images with different numbers of tokens and use the correct image to represent the desired number of tokens, while still having a text label too.