Fix 2 typos

samples/core/get_started/eager.ipynb

@@ -654,7 +654,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "While it's helpful to print out the model's training progress, it's often *more helpful* to see this progress. [TensorBoard](https://www.tensorflow.org/programmers_guide/summaries_and_tensorboard) is a nice visualization tool that is packaged with TensorFlow, but we can create basic charts using the `mathplotlib` module.\n",
+        "While it's helpful to print out the model's training progress, it's often *more* helpful to see this progress. [TensorBoard](https://www.tensorflow.org/programmers_guide/summaries_and_tensorboard) is a nice visualization tool that is packaged with TensorFlow, but we can create basic charts using the `matplotlib` module.\n",
         "\n",
         "Interpreting these charts takes some experience, but you really want to see the *loss* go down and the *accuracy* go up."
       ]