Use markdown to style info box

Author: pbugnion

docs/source/examples/Widget List.ipynb

@@ -1031,14 +1031,13 @@
     "```\n",
     "\n",
     "<div class=\"alert alert-info\">\n",
-    "Changes in <em>ipywidgets 8</em>:\n",
+    "Changes in *ipywidgets 8*:\n",
     "    \n",
-    "The <code>FileUpload</code> changed significantly in ipywidgets 8:\n",
-    "<ul>\n",
-    "    <li>The <code>.value</code> traitlet is now a list of dictionaries with a <code>metadata</code> and <code>content</code> entry, rather than a dictionary mapping the uploaded name to the content. To retrieve the original form, use <code>{f[\"metadata\"][\"name\"]: f[\"content\"].tobytes() for f in uploader.value}</code>.</li>\n",
-    "    <li>The <code>.data</code> traitlet has been removed. To retrieve it, use <code>[f[\"content\"].tobytes() for f in uploader.value]</code>.</li>\n",
+    "The `FileUpload` changed significantly in ipywidgets 8:\n",
     "    \n",
-    "</ul>\n",
+    "- The `.value` traitlet is now a list of dictionaries with a `metadata` and `content` entry, rather than a dictionary mapping the uploaded name to the content. To retrieve the original form, use `{f[\"metadata\"][\"name\"]: f[\"content\"].tobytes() for f in uploader.value}`.\n",
+    "- The `.data` traitlet has been removed. To retrieve it, use `[f[\"content\"].tobytes() for f in uploader.value]`.\n",
+    "- The `.metadata` traitlet has been removed. To retrieve it, use `[f[\"metadata\"]. for f in uploader.value]`.\n",
     "</div>"
    ]
   },