Add PDF link to compatibility cheatsheet notebook

Author: edschofield

docs/notebooks/Writing Python 2-3 compatible code.ipynb

@@ -1,7 +1,7 @@
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  "metadata": {
   "name": "",
-  "signature": "sha256:2e4d4d39759584d5af9864c83f87e39a16b6886cc4be686dad47731f13131d90"
+  "signature": "sha256:4569bf2488b392f4d95eda8d1f5069a4b57beeefd63826b664af5e734716438f"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -24,9 +24,9 @@
       "- **Author:** Ed Schofield.\n",
       "- **Licence:** Creative Commons Attribution.\n",
       "\n",
-      "This notebook shows you idioms for writing future-proof code that is compatible with both versions of Python: 2 and 3.\n",
+      "A PDF version is here: http://python-future.org/compatible_idioms.pdf\n",
       "\n",
-      "It accompanies Ed Schofield's talk at PyCon AU 2014, \"Writing 2/3 compatible code\".\n",
+      "This notebook shows you idioms for writing future-proof code that is compatible with both versions of Python: 2 and 3. It accompanies Ed Schofield's talk at PyCon AU 2014, \"Writing 2/3 compatible code\".\n",
       "\n",
       "Minimum versions:\n",
       "\n",