docs: remove legacy version tag (#7876)

src/swipe/README.md

@@ -189,8 +189,8 @@ Use [ref](https://vuejs.org/v2/api/#ref) to get Swipe instance and call instance
 
 | Name | Description | Attribute | Return value |
 | --- | --- | --- | --- |
-| prev `v2.4.2` | Swipe to prev item | - | - |
-| next `v2.4.2` | Swipe to next item | - | - |
+| prev | Swipe to prev item | - | - |
+| next | Swipe to next item | - | - |
 | swipeTo | Swipe to target index | index: target index, options: Options | - |
 | resize | Resize Swipe when container element resized or visibility changed | - | - |
 

src/swipe/README.zh-CN.md

@@ -199,8 +199,8 @@ export default {
 
 | 方法名 | 说明 | 参数 | 返回值 |
 | --- | --- | --- | --- |
-| prev `v2.4.2` | 切换到上一轮播 | - | - |
-| next `v2.4.2` | 切换到下一轮播 | - | - |
+| prev | 切换到上一轮播 | - | - |
+| next | 切换到下一轮播 | - | - |
 | swipeTo | 切换到指定位置 | index: number, options: Options | - |
 | resize | 外层元素大小或组件显示状态变化时，可以调用此方法来触发重绘 | - | - |