Split out unnecessary comments in code

Author: Simon-van-Diepen

book/notebook_6_numpy/PythonNotebook6_loading_data.ipynb

@@ -193,10 +193,22 @@
     "X,Y = np.meshgrid(x,y)\n",
     "\n",
     "# a function to plot\n",
-    "Z = X**2 + Y**2\n",
-    "# Z has the same shape as X and Y\n",
-    "# each element of Z is computed from the corresponding elements of X and Y\n",
-    "\n",
+    "Z = X**2 + Y**2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "`Z` has the same shape as `X` and `Y`, and each element of `Z` is computed from the corresponding elements of `X` and `Y`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
     "ax = plt.axes(projection='3d')\n",
     "\n",
     "ax.plot_surface(X,Y,Z)\n",