DOC: Update tutorial notebook

Author: effigies

examples/nipype_tutorial.ipynb

@@ -1065,7 +1065,7 @@
      "collapsed": false,
      "input": [
       "from IPython.core.display import Image\n",
-      "Image('realign_with_spm/graph.dot.png')"
+      "Image('realign_with_spm/graph.png')"
      ],
      "language": "python",
      "metadata": {},
@@ -1076,7 +1076,7 @@
      "collapsed": false,
      "input": [
       "realignflow.write_graph(graph2use='orig')\n",
-      "Image('realign_with_spm/graph_detailed.dot.png')"
+      "Image('realign_with_spm/graph_detailed.png')"
      ],
      "language": "python",
      "metadata": {
@@ -1298,7 +1298,7 @@
      "collapsed": false,
      "input": [
       "connectedworkflow.write_graph()\n",
-      "Image('working_dir/connectedtogether/graph.dot.png')"
+      "Image('working_dir/connectedtogether/graph.png')"
      ],
      "language": "python",
      "metadata": {