docs(apollo-federation): explain multigraph use-case

Author: Elies Lou

packages/apollo/tests/code-first-multigraph/main.ts

@@ -3,6 +3,11 @@ import { NestFactory } from '@nestjs/core';
 import { ApplicationModule } from './app.module';
 import { GatewayModule } from './gateway.module';
 
+/**
+ * This use case comes from the need for an application
+ * to be designed in a way which would allow future context
+ * separation from a deployment point of view.
+ */
 export async function bootstrap() {
   const app = await NestFactory.create(ApplicationModule);
   app.useGlobalPipes(new ValidationPipe());