message: docs(dematerialize.ts): move away from bracket casts
diff: @@ -27,9 +27,9 @@ import { OperatorSubscriber } from './OperatorSubscriber';
  * ```ts
  * import { NextNotification, ErrorNotification, of, dematerialize } from 'rxjs';
  *
  - * const notifA = <NextNotification<string>>{ kind: 'N', value: 'A' };
  - * const notifB = <NextNotification<string>>{ kind: 'N', value: 'B' };
  - * const notifE = <ErrorNotification>{ kind: 'E', error: new TypeError('x.toUpperCase is not a function') };
  + * const notifA: NextNotification<string> = { kind: 'N', value: 'A' };
  + * const notifB: NextNotification<string> = { kind: 'N', value: 'B' };
  + * const notifE: ErrorNotification = { kind: 'E', error: new TypeError('x.toUpperCase is not a function') };
  *
  * const materialized = of(notifA, notifB, notifE);
  *
  