Fixed typo (#159)

notebooks/3_NeuralNetworks/autoencoder.ipynb

@@ -33,7 +33,7 @@
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
     "\n",
-    "# Import MINST data\n",
+    "# Import MNIST data\n",
     "from tensorflow.examples.tutorials.mnist import input_data\n",
     "mnist = input_data.read_data_sets(\"MNIST_data\", one_hot=True)"
    ]