linear regression example: remove outdated comment

Author: paul-buerkner

examples/Linear_Regression_Starter.ipynb

@@ -232,7 +232,6 @@
    "outputs": [],
    "source": [
     "def meta():\n",
-    "    # batch_size needs to be present but will be ignored here\n",
     "    # N: number of observation in a dataset\n",
     "    N = np.random.randint(5, 15)\n",
     "    return dict(N=N)"