Could you modify README.md for streamId of WriterOptions?

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### Documentation Request

I think it is better to delete streamId in JSONWriter constructor in README.md

README.md is writed about blew.

```javascript
const streamId = connection.getStreamId();

const writer = new JSONWriter({
streamId,
connection,
protoDescriptor,
});
```

But WriterOptions has not streamId of properties and JSONWriter not use streamId.
https://github.com/googleapis/nodejs-bigquery-storage/blob/v5.1.0/src/managedwriter/writer.ts#L36

So, if we use typescript, then it occures error of typescript.

I think it is better to delete streamId of JSONWriter in README.md if we don't use it in the future

Thank you for your reading this issue 🙇

If there is a common understanding and no one is available, I will create a PR for README.md and related documents.