docs: update

Author: antfu

README.md

@@ -8,7 +8,6 @@
 
 Support [GitHub-style alerts](https://github.com/orgs/community/discussions/16925) for [markdown-it](https://github.com/markdown-it/markdown-it).
 
-```markdown
 > [!NOTE]  
 > Highlights information that users should take into account, even when skimming.
 
@@ -23,22 +22,23 @@ Support [GitHub-style alerts](https://github.com/orgs/community/discussions/1692
 
 > [!CAUTION]
 > Negative potential consequences of an action.
-```
 
-> [!NOTE]  
+```
+> [!NOTE]
 > Highlights information that users should take into account, even when skimming.
 
 > [!TIP]
 > Optional information to help a user be more successful.
 
-> [!IMPORTANT]  
+> [!IMPORTANT]
 > Crucial information necessary for users to succeed.
 
-> [!WARNING]  
+> [!WARNING]
 > Critical content demanding immediate user attention due to potential risks.
 
 > [!CAUTION]
 > Negative potential consequences of an action.
+```
 
 ## Usage