update notebook example

docs/examples/Cython Magics.ipynb

 {
  "metadata": {
-  "name": "Cython Magics"
+  "name": "",
+  "signature": "sha256:72d92961ad5ed0edc2b71d8b835c31c35d82d67c6f7f2360d56c2c708f1d9767"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,14 +28,14 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "IPtyhon has a `cythonmagic` extension that contains a number of magic functions for working with Cython code. This extension can be loaded using the `%load_ext` magic as follows:"
+      "Cython has an IPython extension that contains a number of magic functions for working with Cython code. This extension can be loaded using the `%load_ext` magic as follows:"
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "%load_ext cythonmagic"
+      "%load_ext cython"
      ],
      "language": "python",
      "metadata": {},
@@ -79,6 +80,7 @@
      "metadata": {},
      "outputs": [
       {
+       "metadata": {},
        "output_type": "pyout",
        "prompt_number": 3,
        "text": [
@@ -126,6 +128,7 @@
      "metadata": {},
      "outputs": [
       {
+       "metadata": {},
        "output_type": "pyout",
        "prompt_number": 5,
        "text": [
@@ -200,6 +203,7 @@
      "metadata": {},
      "outputs": [
       {
+       "metadata": {},
        "output_type": "pyout",
        "prompt_number": 7,
        "text": [