[docs:query] add useQuery() manual call example at overview

Author: ryota-murakami

docs/rtk-query/overview.md

@@ -152,7 +152,9 @@ import { useGetPokemonByNameQuery } from './services/pokemon'
 export default function App() {
   // Using a query hook automatically fetches data and returns query values
   const { data, error, isLoading } = useGetPokemonByNameQuery('bulbasaur')
-
+  // You can also perform with raw endpoints name and useQuery() API
+  // const { data, error, isLoading } = pokemonApi.endpoints.getPokemonByName.useQuery('bulbasaur')
+  
   // render UI based on data and loading state
 }
 ```