Amplify Docs are out of sync with AppSync Events Developer Guide

**Describe the content issue**:
[The Amplify docs](https://docs.amplify.aws/react/build-a-backend/data/subscribe-data/) provide no explanation of [the workflow that the AppSync Events docs suggest](https://docs.aws.amazon.com/appsync/latest/eventapi/build-amplify-app.html) for integrating with Amplify.

**URL page where content issue is**:
Linked above: https://docs.amplify.aws/react/build-a-backend/data/subscribe-data/
Linked above: https://docs.aws.amazon.com/appsync/latest/eventapi/build-amplify-app.html

Compare the Amplify subscribe-data page with the AppSync Events Developer Guide workflow linked in the issue. Start by reading both pages and identify the missing integration steps; the work is done when the Amplify documentation explains that workflow accurately and remains consistent with the AppSync guide.

Written by the indexing model from the issue text.