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docs: update form docs description (#44548)

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* Update index.zh-CN.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* add quotes 

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* Update index.en-US.md

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* Update index.en-US.md

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* Update index.en-US.md

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* Update components/form/index.zh-CN.md

Co-authored-by: Amumu <yoyo837@hotmail.com>
Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update index.en-US.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update index.en-US.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update index.en-US.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update index.en-US.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update index.en-US.md

Signed-off-by: Serene Ding <sereneding123@gmail.com>

* Update components/form/index.zh-CN.md

Signed-off-by: lijianan <574980606@qq.com>

---------

Signed-off-by: Serene Ding <sereneding123@gmail.com>
Signed-off-by: lijianan <574980606@qq.com>
Co-authored-by: Amumu <yoyo837@hotmail.com>
Co-authored-by: lijianan <574980606@qq.com>
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components/form/index.en-US.md
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@ -161,7 +161,9 @@ Used when there are dependencies between fields. If a field has the `dependencie
Form updates only the modified field-related components for performance optimization purposes by incremental update. In most cases, you only need to write code or do validation with the [`dependencies`](#dependencies) property. In some specific cases, such as when a new field option appears with a field value changed, or you just want to keep some area updating by form update, you can modify the update logic of Form.Item via the `shouldUpdate`.
When `shouldUpdate` is `true`, any Form update will cause the Form.Item to be re-rendered. This is very helpful for custom rendering some areas:
When `shouldUpdate` is `true`, any Form update will cause the Form.Item to be re-rendered. This is very helpful for custom rendering some areas. It should be noted that the child component should be returned in a function, otherwise `shouldUpdate` won't behave correctly:
related issue: [#34500](https://github.com/ant-design/ant-design/issues/34500)
```jsx
<Form.Item shouldUpdate>

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components/form/index.zh-CN.md
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@ -162,7 +162,9 @@ const validateMessages = {
Form 通过增量更新方式，只更新被修改的字段相关组件以达到性能优化目的。大部分场景下，你只需要编写代码或者与 [`dependencies`](#dependencies) 属性配合校验即可。而在某些特定场景，例如修改某个字段值后出现新的字段选项、或者纯粹希望表单任意变化都对某一个区域进行渲染。你可以通过 `shouldUpdate` 修改 Form.Item 的更新逻辑。
当 `shouldUpdate` 为 `true` 时，Form 的任意变化都会使该 Form.Item 重新渲染。这对于自定义渲染一些区域十分有帮助：
当 `shouldUpdate` 为 `true` 时，Form 的任意变化都会使该 Form.Item 重新渲染。这对于自定义渲染一些区域十分有帮助，要注意 Form.Item 里包裹的子组件必须由函数返回，否则 `shouldUpdate` 不会起作用：
相关issue：[#34500](https://github.com/ant-design/ant-design/issues/34500)
```jsx
<Form.Item shouldUpdate>