Add GraphQL endpoint when using SF Flex (#762)

Author: alanpoulain

core/graphql.md

@@ -20,6 +20,9 @@ docker-compose exec php composer req webonyx/graphql-php && bin/console cache:cl
 
 You can now use GraphQL at the endpoint: `https://localhost:8443/graphql`.
 
+*Note:* If you used [Symfony Flex to install API Platform](../distribution/index.md#using-symfony-flex-and-composer-advanced-users),
+the GraphQL endpoint will be: `https://localhost:8443/api/graphql`.
+
 ## GraphiQL
 
 If Twig is installed in your project, go to the GraphQL endpoint with your browser. You will see a nice interface provided by GraphiQL to interact with your API.

distribution/index.md

@@ -656,7 +656,7 @@ need to install the [graphql-php](https://webonyx.github.io/graphql-php/) librar
 docker-compose exec php composer req webonyx/graphql-php && docker-compose exec php bin/console cache:clear
 ```
 
-You now have a GraphQL API! Open `https://localhost:8443/graphql` to play with it using the nice [GraphiQL](https://github.com/graphql/graphiql)
+You now have a GraphQL API! Open `https://localhost:8443/graphql` (or `https://localhost:8443/api/graphql` if you used Symfony Flex to install API Platform) to play with it using the nice [GraphiQL](https://github.com/graphql/graphiql)
 UI that is shipped with API Platform:
 
 ![GraphQL endpoint](images/api-platform-2.2-graphql.png)