fix typo

notebooks/3 - Neural Networks/convolutional_network.ipynb

@@ -8,7 +8,7 @@
    },
    "outputs": [],
    "source": [
-    "# A Convolutional Networ implementation example using TensorFlow library.\n",
+    "# A Convolutional Network implementation example using TensorFlow library.\n",
     "# This example is using the MNIST database of handwritten digits\n",
     "# (http://yann.lecun.com/exdb/mnist/)\n",
     "\n",