doc: Update README.md

Author: jaywcjlove

core/README-zh.md

@@ -109,7 +109,7 @@ export type CodeBlockData = {
 
 ## 配置 meta 标识
 
-注意：需要在代码块示例中添加特殊的 `meta` 标识，`loader` 才会去索引对于的 `react` 示例，进行代码转换。
+注意 ⚠️：需要在代码块示例中添加特殊的 `meta` 标识，`loader` 才会去索引对于的 `react` 示例，进行代码转换。
 
 1. `mdx:` 特殊标识前缀
 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。

core/README.md

@@ -109,7 +109,7 @@ Pass the `markdown` file content string, and return the converted code block par
 
 ## Configure meta ID
 
-Note: You need to add a special `meta` identifier to the code block example, and `loader` will index the `react` example for code conversion.
+Note ⚠️: You need to add a special `meta` identifier to the code block example, and `loader` will index the `react` example for code conversion.
 
 1. `mdx:` special identifier prefix
 2. `mdx:preview` Controls whether to perform example indexing, and obtain the required example object through the corresponding line number.