docs(switchMap): change example description

* docs(operators): Rerun is changed to Return

* docs: change example description

Co-authored-by: Nicholas Jamieson <nicholas@cartant.com>

src/internal/operators/switchMap.ts

@@ -56,7 +56,7 @@ export function switchMap<T, R, O extends ObservableInput<any>>(
  * // ... and so on
  * ```
  *
- * Rerun an interval Observable on every click event
+ * Restart an interval Observable on every click event
  * ```ts
  * import { fromEvent, interval } from 'rxjs';
  * import { switchMap } from 'rxjs/operators';