message: docs(delay): add relevant operator links to delay docs
  * docs(delay): add relevant operator links to delay docs
  should help close
  * docs: add throttle; re-order
diff: @@ -41,8 +41,15 @@ import { timer } from '../observable/timer';
  * delayedClicks.subscribe(x => console.log(x));
  * ```
  *
  - * @see {@link debounceTime}
  * @see {@link delayWhen}
  + * @see {@link throttle}
  + * @see {@link throttleTime}
  + * @see {@link debounce}
  + * @see {@link debounceTime}
  + * @see {@link sample}
  + * @see {@link sampleTime}
  + * @see {@link audit}
  + * @see {@link auditTime}
  *
  * @param {number|Date} due The delay duration in milliseconds (a `number`) or
  * a `Date` until which the emission of the source items is delayed.
  