Fix readme

Author: LukasMirbt

packages/go_router_builder/README.md

@@ -462,9 +462,7 @@ Define a relative route by extending `RelativeGoRouteData`.
 
 <?code-excerpt "example/lib/readme_excerpts.dart (relativeRoute)"?>
 ```dart
-@TypedRelativeGoRoute<DetailsRoute>(
-  path: 'details',
-)
+@TypedRelativeGoRoute<DetailsRoute>(path: 'details')
 class DetailsRoute extends RelativeGoRouteData with _$DetailsRoute {
   const DetailsRoute();