message: docs(pullup): optimize doc
diff: @@ -116,7 +116,6 @@ bs.closePullUp()
  export interface PullUpLoadConfig {
  threshold: number
  - stop: number
  }
  ```
  @@ -139,6 +138,8 @@ bs.closePullUp()
  - **Arguments**: None
  - **Trigger**: When the distance to the bottom is less than the value of `threshold`, a `pullingUp` event is triggered.
  + > When threshold is a positive number, it means `pullingUp` is triggered when the threshold pixel is away from the scroll boundary. On the contrary, it means that the event will be triggered when it crosses the scroll boundary.
  +
  ::: danger Note
  After the pullUpLoad action is detected, the consumption opportunity of the `pullingUp` event is only once, so you need to call `finishPullUp()` to tell BetterScroll to provide the next consumption opportunity of the `pullingUp` event.
  :::
  