Add note about standalone server's 50mb default body-parser limit

docs/source/api/standalone.mdx

@@ -9,7 +9,7 @@ This API reference documents the `startStandaloneServer` function.
 
 ## Overview
 
-This `startStandaloneServer` function helps you get started with Apollo Server quickly. This function is recommended for all projects that don't require serverless support or a particular Node.js framework (such as Fastify). Under the hood, the `startStandaloneServer` function uses Apollo Server 4's Express integration (i.e., [`expressMiddleware`](./express-middleware)). 
+This `startStandaloneServer` function helps you get started with Apollo Server quickly. This function is recommended for all projects that don't require serverless support or a particular Node.js framework (such as Fastify). Under the hood, the `startStandaloneServer` function uses Apollo Server 4's Express integration (i.e., [`expressMiddleware`](./express-middleware)).
 
 Because it sets helpful defaults, this function is less configurable than other Apollo Server integrations. Complex projects might eventually need to [swap to using `expressMiddleware`](#swapping-to-expressmiddleware) (this process is straightforward).
 
@@ -30,7 +30,7 @@ const server = new ApolloServer({ typeDefs, resolvers });
 // `startStandaloneServer` returns a `Promise` with the
 // the URL that the server is listening on.
 const { url } = await startStandaloneServer(server); //highlight-line
-``` 
+```
 
 </MultiCodeBlock>
 
@@ -59,7 +59,7 @@ The `startStandaloneServer` function's second optional argument is an object for
 
 <td>
 
-An optional asynchronous [`context` initialization function](../data/resolvers#the-context-argument). 
+An optional asynchronous [`context` initialization function](../data/resolvers#the-context-argument).
 
 The `context` function should return an object that all your server's resolvers share during an operation's execution. This enables resolvers to share helpful context values, such as a database connection.
 
@@ -91,7 +91,7 @@ If no `port` is specified, this defaults to using `{port: 4000}`.
 </tbody>
 </table>
 
-### Example 
+### Example
 
 Below is a full example of setting up `startStandaloneServer`:
 
@@ -196,7 +196,8 @@ await server.start();
 // and our expressMiddleware function.
 app.use('/',
   cors<cors.CorsRequest>(),
-  bodyParser.json(),
+  // 50mb is the limit that `startStandaloneServer` uses, but you may configure this to suit your needs
+  bodyParser.json({ limit: '50mb' }),
   // expressMiddleware accepts the same arguments:
   // an Apollo Server instance and optional configuration options
   expressMiddleware(server, {
@@ -208,4 +209,4 @@ app.use('/',
 await new Promise<void>(resolve => httpServer.listen({ port: 4000 }, resolve));
 console.log(`🚀 Server ready at http://localhost:4000/`);
 ```
-</MultiCodeBlock>
+</MultiCodeBlock>