It came to my attention recently that using [`last 2 versions` may be considered harmful](https://jamie.build/last-2-versions). This specific article uses Babel as an example, but I also remembered that autoprefixer uses Browserlist. I was erroneously thinking that by using `last 2 versions` I would be targetting only most recent browsers, but I learned that it also targets "dead" browsers.

Browserlist's repo [recently added a best practise section](browserslist/browserslist@019cb29) mentioning this.

I was thinking it would be a good idea to also update the examples here.

* Update documentation about "ignore next" comment

* Add tests for "ignore next" comment

* Actualize test cases for "ignore next" comment

* Support comment "ignore next"

* Use Node#prev shortcut to find sibling comment "ignore next"

* Fixed typo

* Actualize test cases for "ignore next"

* Disable only rule or at-rule without inner properties in case of rules with "ignore next" comment