docs(example): add update label

example/src/index.js

@@ -16,6 +16,7 @@ import EdgeTypes from './EdgeTypes';
 import CustomConnectionLine from './CustomConnectionLine';
 import NodeTypeChange from './NodeTypeChange';
 import UpdatableEdge from './UpdatableEdge';
+import UpdateLabel from './UpdateLabel';
 
 import './index.css';
 
@@ -84,6 +85,11 @@ const routes = [
     component: UpdatableEdge,
     label: 'Updatable Edge',
   },
+  {
+    path: '/update-label',
+    component: UpdateLabel,
+    label: 'Update Label',
+  },
 ];
 
 const navLinks = routes.filter((route) => route.label);