Update Apollo Server code snippet

Resolves #1078

Author: bignimbus

src/code/language-support/javascript/server/apollo-server.md

@@ -15,30 +15,30 @@ npm install @apollo/server graphql
 Then run `node server.js` with this code in `server.js`:
 
 ```js
-import { ApolloServer } from "@apollo/server"
-import { startStandaloneServer } from "@apollo/server/standalone"
-import { buildSchema } from "graphql"
+import { ApolloServer } from '@apollo/server';
+import { startStandaloneServer } from '@apollo/server/standalone';
 
-const schema = buildSchema(`
-   type Query {
-      hello: String
-   }
-`)
+// The GraphQL schema
+const typeDefs = `#graphql
+  type Query {
+    hello: String
+  }
+`;
 
+// A map of functions which return data for the schema.
 const resolvers = {
   Query: {
-    hello: () => "Hello World!",
+    hello: () => 'world',
   },
-}
+};
 
 const server = new ApolloServer({
   typeDefs,
   resolvers,
-})
+});
 
-const { url } = await startStandaloneServer(server)
-
-console.log(`🚀 Server ready at ${url}`)
+const { url } = await startStandaloneServer(server);
+console.log(`🚀 Server ready at ${url}`);
 ```
 
 Apollo Server has a built in standalone HTTP server and middleware for Express, and has an framework integration API that supports all [Node.js HTTP server frameworks and serverless environments](https://www.apollographql.com/docs/apollo-server/integrations/integration-index) via community integrations.