docs: update README

Author: JounQin

packages/eslint-mdx/README.md

@@ -148,7 +148,7 @@ npm i -D eslint-plugin-mdx
 
 2. `extensions` (`string | string[]`): `eslint-mdx` will only resolve `.mdx` files by default, files with other extensions will be resolved by the `parser` option. If you want to resolve other extensions as like `.mdx`, you can use this option.
 
-3. `markdownExtensions` (`string | string[]`): `eslint-mdx` will only treat `.md` files as plain markdown by default, and will lint them via [remark-lint][] plugins. If you want to resolve other extensions as like `.md`, you can use this option.
+3. `markdownExtensions` (`string | string[]`): `eslint-mdx` will only treat `.md` files as plain markdown by default, and will lint them via remark plugins. If you want to resolve other extensions as like `.md`, you can use this option.
 
 ## Rules