docs: Add FAQ to popconfirm (ant-design#48055)

Author: CooperHash

components/popconfirm/index.en-US.md

@@ -54,6 +54,12 @@ Consult [Tooltip's documentation](/components/tooltip/#api) to find more APIs.
 
 <ComponentTokenTable component="Popconfirm"></ComponentTokenTable>
 
+## FAQ
+
+### Why does the warning findDOMNode is deprecated some times appear in strict mode?
+
+This is due to the implementation of `rc-trigger`. `rc-trigger` forces children to accept ref, otherwise it will fall back to findDOMNode, so children need to be native html tags. If not, you need to use `React.forwardRef` transparently passes `ref` to native html tags.
+
 ## Note
 
 Please ensure that the child node of `Popconfirm` accepts `onMouseEnter`, `onMouseLeave`, `onFocus`, `onClick` events.

components/popconfirm/index.zh-CN.md

@@ -55,6 +55,12 @@ demo:
 
 <ComponentTokenTable component="Popconfirm"></ComponentTokenTable>
 
+## FAQ
+
+### 为何在严格模式中有时候会出现 findDOMNode is deprecated 这个警告？
+
+这是由于 `rc-trigger` 的实现方式导致的，`rc-trigger` 强制要求 children 能够接受 ref，否则就会 fallback 到 findDOMNode，所以 children 需要是原生 html 标签，如果不是，则需要使用 `React.forwardRef` 把 `ref` 透传到原生 html 标签。
+
 ## 注意
 
 请确保 `Popconfirm` 的子元素能接受 `onMouseEnter`、`onMouseLeave`、`onFocus`、`onClick` 事件。