fix tanstack router useHref example (#7148)

Author: kveperedo

packages/dev/docs/pages/react-aria/routing.mdx

@@ -288,7 +288,7 @@ function RootRoute() {
   return (
     <RouterProvider 
       navigate={(to, options) => router.navigate({to, ...options})}
-      useHref={to => router.buildLocation(to).href}>
+      useHref={to => router.buildLocation({to}).href}>
       {/* ...*/}
     </RouterProvider>
   );

packages/dev/docs/pages/react-spectrum/routing.mdx

@@ -292,7 +292,7 @@ function RootRoute() {
       theme={defaultTheme}
       router={{
         navigate: (to, options) => router.navigate({to, ...options}),
-        useHref: to => router.buildLocation(to).href
+        useHref: to => router.buildLocation({to}).href
       }}>
       {/* ...*/}
     </Provider>