Correct the example notebook link to What is the IPython Notebook?

examples/Notebook/Index.ipynb

@@ -1,7 +1,7 b''
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:fe084460e647ed671f6335e872a6b8e83a00f03dd2c1c47122f99e1218164cf4"
+  "signature": "sha256:5a3c5ebae9154e13957e7c9d28bd3b7697c4b14f965482feb288d2cdf078983e"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -49,7 +49,7 b''
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "* [What is the IPython Notebook?](What is the IPython Notebook%3F.ipynb)\n",
+      "* [What is the IPython Notebook](What is the IPython Notebook.ipynb)\n",
       "* [Running the Notebook Server](Running the Notebook Server.ipynb)\n",
       "* [Notebook Basics](Notebook Basics.ipynb)\n",
       "* [Running Code](Running Code.ipynb)\n",