docs(start/testing): update imports

[brophdawg11]

Closes #12185

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[ondrejsevcik]

It would be nice to include some examples in the documentation that show how to work with nested routes. The current documentation (v6) has the following one:

const router = createBrowserRouter([
  {
    path: "/",
    element: <Root />,
    loader: rootLoader,
    children: [
      {
        path: "team",
        element: <Team />,
        loader: teamLoader,
      },
    ],
  },
]);

[brophdawg11]

The docs are still in flux during the prerelease so we'll be expanding them as we get closer to a stable release - and we'll get some info on nested routes in there 👍