chore: fix docs example

Author: lukasbach

packages/docs/docs/guides/search.mdx

@@ -184,11 +184,11 @@ function App() {
         dataProvider={dataProvider}
         getItemTitle={item => item.data}
         viewState={{
-          'tree-1': {},
+          'tree-4': {},
         }}
       >
         <Tree
-          treeId="tree-1"
+          treeId="tree-4"
           rootItem="root"
           treeLabel="Tree Example"
           ref={tree}