Fix typo in intro to scan in Theano notebook.

Author: donnemartin

deep-learning/theano-tutorial/scan_tutorial/scan_tutorial.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Introduction to Scan Theano\n",
+    "# Introduction to Scan in Theano\n",
     "\n",
     "Credits: Forked from [summerschool2015](https://github.com/mila-udem/summerschool2015) by mila-udem\n",
     "\n",