Expand docs in colab notebook

examples/pysr_demo.ipynb

@@ -1391,7 +1391,9 @@
       "source": [
         "A neural network can easily undo a linear transform, so this is fine: the network for $f$ will learn to undo the linear transform.\n",
         "\n",
-        "Then, we can learn another analytic equation for $z$."
+        "This likely won't find the exact result, but it should find something similar. You may wish to try again but with many more `total_steps` for the neural network (10,000 is quite small!).\n",
+        "\n",
+        "Then, we can learn another analytic equation for $f$."
       ]
     },
     {