docs: remove callback doc (#46452)

components/form/index.en-US.md

@@ -567,26 +567,6 @@ Form.Item default bind value to `value` prop, but Switch or Checkbox value prop
 </Form.Item>
 ```
 
-### Custom validator not working
-
-It may be caused by your `validator` if it has some errors that prevents `callback` to be called. You can use `async` instead or use `try...catch` to catch the error:
-
-```jsx
-validator: async (rule, value) => {
-  throw new Error('Something wrong!');
-}
-
-// or
-
-validator(rule, value, callback) => {
-  try {
-    throw new Error('Something wrong!');
-  } catch (err) {
-    callback(err);
-  }
-}
-```
-
 ### How does `name` fill value when it's an array?
 
 `name` will fill value by array order. When there exists number in it and no related field in form store, it will auto convert field to array. If you want to keep it as object, use string like: `['1', 'name']`.

components/form/index.zh-CN.md

@@ -566,26 +566,6 @@ Form.Item 默认绑定值属性到 `value` 上，而 Switch、Checkbox 等组件
 </Form.Item>
 ```
 
-### 自定义 validator 没有效果
-
-这是由于你的 `validator` 有错误导致 `callback` 没有执行到。你可以选择通过 `async` 返回一个 promise 或者使用 `try...catch` 进行错误捕获：
-
-```jsx
-validator: async (rule, value) => {
-  throw new Error('Something wrong!');
-}
-
-// or
-
-validator(rule, value, callback) => {
-  try {
-    throw new Error('Something wrong!');
-  } catch (err) {
-    callback(err);
-  }
-}
-```
-
 ### name 为数组时的转换规则？
 
 当 `name` 为数组时，会按照顺序填充路径。当存在数字且 form store 中没有该字段时会自动转变成数组。因而如果需要数组为 key 时请使用 string 如：`['1', 'name']`。