docs(react-docgen): add some limit and more info

packages/document/module-doc/docs/en/guide/basic/use-module-doc.mdx

@@ -245,7 +245,20 @@ export const Button = (props?: ButtonProps) => {};
 ```
 
 The above is a standard writeup where `ButtonProps` will be extracted into the table and `Button` will be the title of the table.
-If you use the default export, the filename will be used as the form title. The generated content is as follows:
+If you use the default export, the filename will be used as the form title.
+
+Notice that export features declared elsewhere are not available.
+
+```tsx
+const A = () => {};
+
+export { A }; // wrong
+export default A; // wrong
+export const B = () => {}; // right
+export default () => {}; // right
+```
+
+The generated content is as follows:
 
 ```mdx
 ### ButtonTest
@@ -267,6 +280,12 @@ If React types are used in Props, you need to add the types in tsconfig.json, ot
 }
 ```
 
+The best way is that you import the type directly:
+
+```tsx
+import { FC } from 'react';
+```
+
 :::
 
 - `documentation` is used in tool library scenarios to parse JSDoc annotations.

packages/document/module-doc/docs/zh/guide/basic/use-module-doc.mdx

@@ -239,8 +239,20 @@ export type ButtonProps = {
 export const Button = (props?: ButtonProps) => {};
 ```
 
-上面是一个标准写法，其中 `ButtonProps` 将被提取至表格中， `Button` 作为表格的标题。
-如果使用默认导出，文件名将作为表格标题。生成的内容如下：
+上面是一个标准写法，其中 `ButtonProps` 将被提取至表格中， `Button` 作为表格的标题。如果使用默认导出，文件名将作为表格标题。
+
+需要注意的是，export 导出事先定义的特性将不会被解析。
+
+```tsx
+const A = () => {};
+
+export { A }; // wrong
+export default A; // wrong
+export const B = () => {}; // right
+export default () => {}; // right
+```
+
+生成的内容如下：
 
 ```mdx
 ### ButtonTest
@@ -262,6 +274,12 @@ export const Button = (props?: ButtonProps) => {};
 }
 ```
 
+更好的方式是直接引用类型，例如
+
+```tsx
+import { FC } from 'react';
+```
+
 :::
 
 - `documentation`适用于工具库场景，用来解析 JSDoc 注释。