Update title to match other beginner guides.

Author: lamberta

samples/core/get_started/eager.ipynb

@@ -63,7 +63,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "# Getting started using eager execution\n",
+        "# Get Started with Eager Execution\n",
         "\n",
         "Note: you can run **[this notebook, live in Google Colab](https://colab.research.google.com/github/tensorflow/models/blob/master/samples/core/get_started/eager.ipynb)** with zero setup.\n",
         "\n",