Fix typo in ch09 notebook

09_up_and_running_with_tensorflow.ipynb

@@ -44,7 +44,7 @@
    "cell_type": "code",
    "execution_count": 1,
    "metadata": {
-    "collapsed": true,
+    "collapsed": false,
     "deletable": true,
     "editable": true
    },
@@ -286,8 +286,8 @@
    "source": [
     "with tf.Session() as sess:\n",
     "    y_val, z_val = sess.run([y, z])\n",
-    "    print(y)  # 10\n",
-    "    print(z)  # 15"
+    "    print(y_val)  # 10\n",
+    "    print(z_val)  # 15"
    ]
   },
   {
@@ -1927,7 +1927,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.2+"
+   "version": "3.5.3"
   },
   "nav_menu": {
    "height": "603px",