doc: update document. (#247)

Author: jaywcjlove

core/README.md

@@ -81,8 +81,6 @@ export default function Demo() {
 
 syntax: <code>```jsx {1,4-5}</code>
 
-⚠️ `v5` version `highlight line` and `Show Line Numbers` functions are invalid and need ~~`[email protected]`~~ to be upgraded.
-
 ```jsx mdx:preview
 import React from 'react';
 import MarkdownPreview from '@uiw/react-markdown-preview';
@@ -118,8 +116,6 @@ export default function Demo() {
 
 syntax: <code>```jsx showLineNumbers {1,4-5}</code>
 
-⚠️ `v5` version `highlight line` and `Show Line Numbers` functions are invalid and need ~~`[email protected]`~~ to be upgraded.
-
 ```jsx mdx:preview?background=#fff
 import React from 'react';
 import MarkdownPreview from '@uiw/react-markdown-preview';