Normalize notebook titles

samples/core/get_started/basic_classification.ipynb

@@ -103,7 +103,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "# Train your first neural network "
+        "# Train your first neural network: basic classification"
       ]
     },
     {

samples/core/get_started/basic_regression.ipynb

@@ -91,8 +91,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "# Predicting house prices: a regression example\n",
-        "\n"
+        "# Predict house prices: regression"
       ]
     },
     {