Adding max-content width to custom radiobutton layout in the example docs.

Author: adam-ah

docs/source/examples/Widget List.ipynb

@@ -548,7 +548,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "#### With dynamic layout, no width restriction"
+    "#### With dynamic layout and very long labels"
    ]
   },
   {
@@ -560,7 +560,15 @@
     "widgets.Box(\n",
     "    [\n",
     "        widgets.Label(value='Pizza topping with a very long label:'), \n",
-    "        widgets.RadioButtons(options=['pepperoni', 'pineapple', 'anchovies', 'and the long name that will fit fine'])\n",
+    "        widgets.RadioButtons(\n",
+    "            options=[\n",
+    "                'pepperoni', \n",
+    "                'pineapple', \n",
+    "                'anchovies', \n",
+    "                'and the long name that will fit fine and the long name that will fit fine and the long name that will fit fine '\n",
+    "            ],\n",
+    "            layout={'width': 'max-content'}\n",
+    "        )\n",
     "    ]\n",
     ")"
    ]