[docs:query] add useQuery() manual call example at overview pt2 (#1272)

Author: ryota-murakami

docs/tutorials/rtk-query.mdx

@@ -188,6 +188,8 @@ export default function App() {
   // highlight-start
   // Using a query hook automatically fetches data and returns query values
   const { data, error, isLoading } = useGetPokemonByNameQuery('bulbasaur')
+  // Individual hooks are also accessible under the generated endpoints:
+  // const { data, error, isLoading } = pokemonApi.endpoints.getPokemonByName.useQuery('bulbasaur')
   // highlight-end
 
   return (