Update sample notebook

ipyfilechooser_examples.ipynb

@@ -22,7 +22,6 @@
     "# Title: <b>FileChooser example</b>\n",
     "# Show hidden files: no\n",
     "# Use the default path and filename as selection: yes\n",
-    "# Use folder icons: yes\n",
     "# Only show folders: no\n",
     "fdialog = FileChooser(\n",
     "    os.getcwd(),\n",
@@ -30,7 +29,6 @@
     "    title='<b>FileChooser example</b>',\n",
     "    show_hidden=False,\n",
     "    select_default=True,\n",
-    "    use_dir_icons=True,\n",
     "    show_only_dirs=False\n",
     ")\n",
     "\n",
@@ -80,7 +78,28 @@
     "# Show hidden files, change rows to 10, and hide folder icons\n",
     "fdialog.show_hidden = True\n",
     "fdialog.rows = 10\n",
-    "fdialog.use_dir_icons = False"
+    "fdialog.dir_icon = None"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Change folder icon to `os.sep` and append it to the folder name\n",
+    "fdialog.dir_icon = os.sep\n",
+    "fdialog.dir_icon_append = True"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Restrict navigation\n",
+    "fdialog.sandbox_path = '/Users/jdoe'"
    ]
   },
   {