add name back into Cython Magics notebook

examples/Builtin Extensions/Cython Magics.ipynb

@@ -1,6 +1,6 b''
 {
  "metadata": {
-  "name": "",
+  "name": "Cython Magics",
   "signature": "sha256:c357b93e9480d6347c6677862bf43750745cef4b30129c5bc53cb879a19d4074"
  },
  "nbformat": 3,
@@ -363,4 +363,4 b''
    "metadata": {}
   }
  ]
-}
  No newline at end of file
+}