Removed invisible connecting geometry

repeated first point in 5th position to close knot shape. Added `np.nan` non-rending connection point.

Author: TheAtomicOption

AnatomyOfMatplotlib-Part3-HowToSpeakMPL.ipynb

@@ -512,8 +512,8 @@
    "source": [
     "mpl.rc('axes', prop_cycle=cycler('color', ['r', 'orange', 'c', 'y']) +\n",
     "                          cycler('hatch', ['x', 'xx-', '+O.', '*']))\n",
-    "x = np.array([0.7, 0.3, 0.385, 0.6153, 0.6, 0.4, 0.2, 0.5, 0.8, 0.6])\n",
-    "y = [0.65, 0.65, 0.1, 0.1, 0, 0, -5, -6, -5, 0]\n",
+    "x = np.array([0.7, 0.3, 0.385, 0.6153, 0.7, np.nan, 0.6, 0.4, 0.2, 0.5, 0.8, 0.6])\n",
+    "y = [0.65, 0.65, 0.1, 0.1, 0.65, np.nan, 0, 0, -5, -6, -5, 0]\n",
     "plt.fill(x+1, y)\n",
     "plt.fill(x+2, y)\n",
     "plt.fill(x+3, y)\n",