message: docs: update rxjs example and change fromPromise to from
  the first example at
  PR Close
diff: // #docregion promise
  -import { fromPromise } from 'rxjs';
  +import { from } from 'rxjs';
  // Create an Observable out of a promise
  -const data = fromPromise(fetch('/api/endpoint'));
  +const data = from(fetch('/api/endpoint'));
  // Subscribe to begin listening for async result
  data.subscribe({
  next(response) { console.log(response); },
  