Adding heading

docs/using/visualization/generating_widgets.ipynb

@@ -578,6 +578,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "### Enabling `virtual_packet_logging` Property for Plotting  \n",
+    "\n",
     "<div class=\"alert alert-info\">\n",
     "\n",
     "**Important:** The virtual packet logging capability must be active in order to produce to show virtual packets' spectrum in `Line Info Widget`. Thus, make sure to set `virtual_packet_logging: True` in your configuration file. It should be added under `virtual` property of `spectrum` property, as described in [configuration schema](https://tardis-sn.github.io/tardis/using/components/configuration/configuration.html#spectrum).\n",