Merge pull request #1837 from Tony133/docs/fastify-graphql-warning

docs(graphql): added warning

Author: kamilmysliwiec

content/graphql/quick-start.md

@@ -80,6 +80,8 @@ GraphQLModule.forRoot({
 }),
 ```
 
+> warning **Warning** If you use the `apollo-server-fastify` package with multiple GraphQL endpoints in a single application, make sure to enable the `disableHealthCheck` setting in the `GraphQLModule` configuration.
+
 #### Code first
 
 In the **code first** approach, you use decorators and TypeScript classes to generate the corresponding GraphQL schema.