Update router-module.md

Author: Tony133

content/recipes/router-module.md

@@ -25,7 +25,7 @@ In such a case, instead of repeating the `/dashboard` prefix within each control
 export class AppModule {}
 ```
 
-Next we set the `dashboard` route in the controller decorator like this `@Controller ('dashboard')`.
+Next we set the `dashboard` route in the controller decorator like this `@Controller('dashboard')`.
 
 > info **Hint** The `RouterModule` class is exported from the `@nestjs/core` package.