docs(Anchor): add targetOffset doc

components/anchor/index.en-US.md

@@ -25,6 +25,7 @@ For displaying anchor hyperlinks on page and jumping between them.
 | showInkInFixed | Whether show ink-balls in Fixed mode | boolean | false |  |
 | onClick | set the handler to handle `click` event | Function(e: Event, link: Object) | - | 3.9.0 |
 | getCurrentAnchor | Customize the anchor highlight | () => string | - | 3.21.0 |
+| targetOffset | Scroll to target offset value | number | `offsetTop` |  | 0 | 3.21.0 |
 
 ### Link Props
 

components/anchor/index.zh-CN.md

@@ -26,6 +26,7 @@ title: Anchor
 | showInkInFixed | 固定模式是否显示小圆点 | boolean | false |  |
 | onClick | `click` 事件的 handler | Function(e: Event, link: Object) | - | 3.9.0 |
 | getCurrentAnchor | 自定义高亮的锚点 | () => string | - | 3.21.0 |
+| targetOffset | 滚动到目标的偏移量 | number | `offsetTop` |  | 0 | 3.21.0 |
 
 ### Link Props