demo: demo 코멘트 수정

Author: daybrush

docs/src/pages/Demos.mdx

@@ -60,8 +60,9 @@ You can easily create [iScroll](https://github.com/cubiq/iscroll)-like horizonta
 Made with [@egjs/grid](https://github.com/naver/egjs-grid)
 
 
-
-**If you are using an external React Component, you should use [`forwardedRef`](/docs/quick-start).**
+:::caution
+If you are using an external React Component, you should use [`forwardedRef`](/docs/quick-start).
+:::
 
 
 <Grid />