fix: Update koa's integration guide for body parsing (#3670)

* fix: Update koa's integration guide for body parsing

* fix: typo

website/src/pages/docs/integrations/integration-with-koa.mdx

@@ -30,8 +30,8 @@ const yoga = createYoga<Koa.ParameterizedContext>()
 // Bind GraphQL Yoga to `/graphql` endpoint
 app.use(async ctx => {
   // Second parameter adds Koa's context into GraphQL Context
-  // Make sure it is not `ctx.request` not `ctx.req`
-  // Because sometimes Koa parses the body and puts it in `ctx.req`
+  // If you use any body parsing middleware in your application,
+  // Make sure it is `ctx.request` and not `ctx.req`
   const response = await yoga.handleNodeRequestAndResponse(ctx.request, ctx.res, ctx)
 
   // Set status code