Kinesis Firehose lacking documentation

**Page**: [`ib/analytics/storing/q/platform/js`](https://docs.amplify.aws/lib/analytics/storing/q/platform/js)

**Feedback**:

Should have more detailed information about how to set up Kinesis Firehose and test it, as the methods on this page do not seem to work. The CLI also only allows you to add a Kinesis Data Stream or Pinpoint Dashboard, not a Firehose, which is confusing--if it is possible to use a Firehose despite this there should be some documentation on how exactly it works