[Documentation]: Note has low visibility

[Jaehwa-Noh]

Is there an existing issue for this?

• [X] I have searched the existing issues

Page URL (type "NEW" for a new page suggestion)

https://github.com/android/nowinandroid?tab=readme-ov-file#testing

What's the documentation problem or suggestion?

Docs need improving! Current note section doesn't have proper noticeability. Just look like another plain information text.

Github has some features for notice.

[!Note] Note

Code of Conduct

• [X] I agree to follow this project's Code of Conduct