doc: Update README.md

Author: jaywcjlove

core/README-zh.md

@@ -115,24 +115,27 @@ export type CodeBlockData = {
 2. `mdx:preview` 控制是否进行进行示例索引，通过对应所在行号，获取需要的示例对象。
 3. `mdx:preview:demo12` 通过 `demo12` 唯一标识，准确获取索引的 `示例代码` 或 `示例组件对象`。
 
-    ```tsx mdx:preview
-    import React from "react"
-    const Demo = ()=>{
-      return <div>测试</div>
-    }
-
-    export default Demo
-    ```  
+```markdown
+\```tsx mdx:preview
+import React from "react"
+const Demo = ()=>{
+  return <div>测试</div>
+}
 
+export default Demo
+\```
+```
 
-    ```tsx mdx:preview:demo12
-    import React from "react"
-    const Demo = ()=>{
-      return <div>测试</div>
-    }
+```markdown
+\```tsx mdx:preview:demo12
+import React from "react"
+const Demo = ()=>{
+  return <div>测试</div>
+}
 
-    export default Demo
-    ```
+export default Demo
+\```
+```
 
 ## 开发
 

core/README.md

@@ -115,26 +115,27 @@ Note: You need to add a special `meta` identifier to the code block example, and
 2. `mdx:preview` Controls whether to perform example indexing, and obtain the required example object through the corresponding line number.
 3. `mdx:preview:demo12` Uniquely identified by `demo12`, accurately obtain the `example code` or `example component object` of the index.
 
+```markdown
+\```tsx mdx:preview
+import React from "react"
+const Demo = ()=>{
+  return <div>测试</div>
+}
 
-    ```tsx mdx:preview
-    import React from "react"
-    const Demo = ()=>{
-      return <div>测试</div>
-    }
-
-    export default Demo
-    ```  
-
-
-    ```tsx mdx:preview:demo12
-    import React from "react"
-    const Demo = ()=>{
-      return <div>测试</div>
-    }
+export default Demo
+\```
+```
 
-    export default Demo
-    ```
+```markdown
+\```tsx mdx:preview:demo12
+import React from "react"
+const Demo = ()=>{
+  return <div>测试</div>
+}
 
+export default Demo
+\```
+```
 
 ## Development