Clean up colab notebook

examples/pysr_demo.ipynb

@@ -10,7 +10,15 @@
       ]
     },
     {
-      "attachments": {},
+      "cell_type": "code",
+      "execution_count": null,
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "!echo \"Runtime started.\""
+      ]
+    },
+    {
       "cell_type": "markdown",
       "metadata": {
         "id": "tQ1r1bbb0yBv"
@@ -20,9 +28,9 @@
         "## Instructions\n",
         "1. Work on a copy of this notebook: _File_ > _Save a copy in Drive_ (you will need a Google account).\n",
         "2. (Optional) If you would like to do the deep learning component of this tutorial, ensure the GPU accelerator is turned on, with Edit->Notebook settings->Hardware accelerator->GPU\n",
-        "3. **Use fallback runtime**. Open the command pallette (bottom left -> second icon from the bottom), and search for \"use fallback runtime\", and hit enter.\n",
+        "3. **Use fallback runtime**. Run the above cell (`!echo \"Runtime started.\"`) to start the runtime. Now, open the command pallette (bottom left -> second icon from the bottom), and search for \"use fallback runtime\", and hit enter.\n",
         "   - This is a temporary workaround for a bug in Colab, until the current runtime is patched.\n",
-        "4. Execute the following cell (click on it and press Ctrl+Enter) to install Julia, IJulia and other packages. This takes a couple of minutes.\n",
+        "4. Execute the following cell (click on it and press Ctrl+Enter or Shift+Enter) to install Julia, IJulia and other packages. This takes a couple of minutes.\n",
         "5. Continue to the next section.\n",
         "\n",
         "_Notes_:\n",
@@ -1214,11 +1222,6 @@
       "name": "pysr_demo.ipynb",
       "provenance": []
     },
-    "kernelspec": {
-      "display_name": "Python (main_ipynb)",
-      "language": "python",
-      "name": "main_ipynb"
-    },
     "language_info": {
       "codemirror_mode": {
         "name": "ipython",
@@ -1229,7 +1232,7 @@
       "name": "python",
       "nbconvert_exporter": "python",
       "pygments_lexer": "ipython3",
-      "version": "3.10.9 (main, Dec 15 2022, 17:11:09) [Clang 14.0.0 (clang-1400.0.29.202)]"
+      "version": "3.10.9"
     },
     "widgets": {
       "application/vnd.jupyter.widget-state+json": {