Update CSS Linter for `overflow-anchor`

[dnknn]

overflow-anchor: auto | none
https://caniuse.com/?search=overflow-anchor

https://developer.mozilla.org/docs/Web/CSS/overflow-anchor

Demo: use the mouse wheel to test
overflow-anchor: auto; and overflow-anchor: none;
https://www.zhangxinxu.com/study/202008/scroll-anchor.php
https://www.zhangxinxu.com/study/202008/scroll-anchor.php?none=true

[narcolepticinsomniac]

I thought we had an understanding, dnknn. No misused header markdown, and zero emojis. Please fix it, and remember not to do it here again in the future.

[dnknn]

done. I forgot.. sorry!